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- Question
The sum of 10 terms of the arithmetic series is 390. If the third term of the series is 19. Find the first term
Options- A. 3
- B. 5
- C. 7
- D. 8
- Correct Answer
- 3
- 1. The 4th and 7th term of an arithmetic progression are 11 and -4 respectively. What is the 15th term?
Options- A. -49
- B. -44
- C. -39
- D. -34 Discuss
- 2. What is the largest 4 digit number that is exactly divisible by 93?
Options- A. 9961
- B. 9971
- C. 9981
- D. 9951 Discuss
- 3. The least number which when divides 37044, gives the result a perfect cube, is:
Options- A. 2
- B. 4
- C. 14
- D. 21 Discuss
- 4. The 7th and 12th term of an arithmetic progression are -15 and 5 respectively. What is the 16th term?
Options- A. 25
- B. 29
- C. 21
- D. 33 Discuss
- 5. Of the 3 numbers whose average is 64, the first number is 1/3 times the sum of other 2. The first number is
Options- A. 72
- B. 32
- C. 96
- D. 48 Discuss
- 6. What is the sum of the first 11 terms of an arithmetic progression if the first term is -31 and last term is 29?
Options- A. 42
- B. -11
- C. 28
- D. 12 Discuss
- 7. What is the value of 10.2+10.02+10.002+... upto 9 terms
Options- A. 222222222
- B. 111111111
- C. 555555555
- D. 525252525 Discuss
- 8. The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find two numbers.
Options- A. 10 & 12
- B. 10 & 18
- C. 12 & -18
- D. -12 & 18 Discuss
- 9. Direction: What should come in the place of question mark (?) in the following number series? 9, 11, 16, 26, ?, 69
Options- A. 31
- B. 38
- C. 43
- D. 45 Discuss
- 10. What will come in the place of the question mark (?) in the following number series?305, 338, 404, 503, 635 , (?)
Options- A. 820
- B. 880
- C. 800
- D. 890 Discuss
Numbers problems
Search Results
Correct Answer: -44
Correct Answer: 9951
Correct Answer: 4
Correct Answer: 21
Correct Answer: 48
Correct Answer: -11
Correct Answer: 555555555
Correct Answer: -12 & 18
Explanation:
Given, difference of the squares of two numbers is 180.
= k2 - l2 - 180
Also, square of the smaller number is 8 times the larger.
= l2 = 8k
Thus, k2 - 8a - 180 = 0
k2 ? 18k + 10k - 180 = 0
? k(k - 18) + 10(k ? 18) = 0
= (k + 10)(k ? 18) = 0
? k = -10, 18
Thus, the other number is
324 - 180 = l2
? Numbers are 12, 18 or -12, 18.
Correct Answer: 43
Explanation:
Double Difference pattern is followed in the above series. +2, +5, + 10, +17, +26
Correct Answer: 800
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