Question 1

In the following question, various terms of an alphanumerical series are given with one or more terms missing as shown by (?).Choose the missing terms out of the given alternatives. 2Z5, 7Y7, 14X9, 23W11, 34V13, ?

Accepted Answer

The first numbers increase by 5, 7, 9, 11.... The letters move one step backward. The last numbers are consecutive odd numbers.

Question 2

Find out the wrong term in the series 2, 3, 4, 4, 6, 8, 9, 12, 16

Accepted Answer

The given sequence is a combination of three series: i)1st, 4th, 7th terms i.e, 2, 4, 9 ii)2nd, 5th, 8th terms i.e, 3, 6, 12 iii)3rd, 6th, 9th terms i.e, 4, 8, 16 In each one of i, ii, iii, each term is twice the preceding term. So, 9 is wrong and must be replaced by (4*2) = 8

Question 3

Find the wrong number in the series. 1, 2, 6, 15, 31, 56, 91

Accepted Answer

The difference of the two consecutive numbers are 1, 4, 9, 16, 25, 35. This is clearly , + 1 2 , + 2 2 , + 3 2 , + 4 2 , + 5 2 , + 6 2 Here 35 is wrong, So our wrong number is 91

Question 4

8, 15, 28, 53, ?, 199

Accepted Answer

Here the series of the form is x 2 - 1 , x 2 - 2 , x 2 - 3 , . . . 53 x 2 - 4 = 106 - 4 = 102

Question 5

What should come in place of question mark (?) in the following number series? 132 156 ? 210 240 272

Accepted Answer

The given series follows a logic that 11 x 12, 12 x 13, 13 x 14, 14 x 15, 15 x 16,... So the missing number is 13 x 14 = 182

Question 6

Find the wrong number in the series. 3, 8, 15, 24, 34, 48, 63

Accepted Answer

The difference between consecutive numbers of the given series are respectively 5, 7, 9, 11, 13, and 15. Therefore, 24+11=35 But in your problem it is given as 34.so 34 is wrong number

Question 7

Choose the missing terms out of the given alternatives Z, X, S, I, R, R, ?, ?

Accepted Answer

Z - 2 = X X - 5 = S S - 10 = I I - 17 = R R - 26 = R R - 37 = G G - 50 = I The series 2, 5, 10, 17, 26, 37, 50 is obtained by the pattern +3, +5, +7, +9, . . . .

Question 8

Choose the missing terms out of the given alternatives Z, S, W, O, T, K, Q, G, ?, ?

Accepted Answer

The given sequence a combination of two series: I)Z, W, T, Q, ? and II)S, O, K, G, ? The pattern I is Z - 3 = W W - 3 = T T - 3 = Q Q - 3 = N The pattern in II is S - 4 = O O - 4 = K K - 4 = G G - 4 = C

Question 9

7, 8, 18, 57, ?, 1165, 6996

Accepted Answer

Here 2nd number = (1st number x 1 )+1 3rd number = (2nd number x 2 +2) 4th number = (3rd number x 3 )+3 and so on.. Therefore, 5th number = (4th number x 4) +4 =57 x 4 + 4 =232.

Question 10

Find the wrong number in the series 7, 28, 63, 124, 215, 342, 511

Accepted Answer

Here the number follows the given rule 2 3 - 1 , 3 3 - 1 , 4 3 - 1 , 5 3 - 1 , . . . But 28 has been given in problem series. so 28 is wrong number.

Question 11

In the following question, various terms of an alphabet series are given with one or more terms missing as shown by (?). Choose the missing terms out of the given alternatives. AZ, GT, MN, ?, YB

Accepted Answer

First letter moves 6 steps forward. Second letter moves 6 steps backward.

Question 12

Find the missing term in the following series ? 10000, 11000, 9900, 10890, ?, 10781

Accepted Answer

Clearly, alternatively we add and subtract 10% of a term to obtain the next term of the series. Thus, 10000 + (10% of 10000)= 11000; 11000 - (10% of 11000) = 9900; 9900 + (10% of 9900) = 10890; 10890 - (10% of 10890) = 9801. 9801 + (10% of 9801) = 9801+980 = 10781. So, missing term = 10890- (10% of 10890)= 9801.

Question 13

Find out the wrong term in the series 0, 2, 3, 5, 8, 10, 15, 18, 24, 26, 35

Accepted Answer

The given sequence is a combination of two series: i)0, 3, 8, 15, 24, 35 ii)2, 5, 10, 18, 26 The pattern in both i, ii is +3, +5, +7, . . . . So, in ii) 18 is wrong and must be replaced by (10 + 7) = 17

Question 14

Choose the missing terms out of the given alternatives DHL, PTX, BFJ, ?

Accepted Answer

1.)D + 12 = P P + 12 = B B + 12 = N 2.)H + 12 = T T + 12 = F F + 12 = R 3.)L + 12 = X X + 12 = J J + 12 = V

Question 15

What will come in place of question mark(?) in the following number series ? 6859 5832 ? 4096 3375

Accepted Answer

The given series follows a pattern that, 19 x 19 x 19 = 6859 18 x 18 x 18 = 5832 17 x 17 x 17 = 4913 16 x 16 x 16 = 4096 15 x 15 x 15 = 3375 So, the missing number in the given series = 4913

Question 16

Find out the wrong term in the series 380, 188, 92, 48, 20, 8, 2

Accepted Answer

The correct pattern is -192, -96, -48, -24, -12, -6 So, 48 is wrong and must be replaced by (92 - 48) = 44

Question 17

Complete the number series given below ? 13 19 37 ? 141 243

Accepted Answer

75

Question 18

Choose the missing terms out of the given alternatives ATTRIBUTION, TTRIBUTIO, RIBUTIO, IBUTI

Accepted Answer

In the first step, one letter from the beginning and one from the end of a term are removed to give the next term . In the second step, two letters from the beginning of the term are removed. These two steps are repeated alternatively

Question 19

Find the wrong number in the given series. 8, 27, 125, 343, 1381

Accepted Answer

Given series follows Cubes on Prime Numbers i.e 2 3 , 3 3 , 5 3 , . . . but 9 3 is 1331 so 1381 is wrong

Question 20

What will come in place of the question mark (?) in the following number series? 312 231 295 ? 282 257

Accepted Answer

The series follows a pattern that, -92, +82, -72, +62, -52

Number Series Questions