Numbers problems
- 1. What will come in place of the question mark (?) in the following number series? 3240, 540, 108, 27, ?, 4.5
Options- A. 7
- B. 10
- C. 9
- D. 8 Also asked in: AIEEE, Bank Exams, GATE
Correct Answer: 9
Explanation:
Ans.
540 = 3240/6
108 = 540/5
27 = 108/4
? = 27/3, i.e. ? = 9
- 2. What will come in place of the question mark in the series below? 3, 5, 15, 45, 113, ?
Options- A. 250
- B. 243
- C. 247
- D. 261 Also asked in: AIEEE, Bank Exams, GATE
Correct Answer: 243
Explanation:
Ans.
5 = 3 + (13 + 1)
15 = 5 + (23 + 2)
45 = 15 + (33 + 3)
113 = 45 + (43 + 4)
? = 113 + (53 + 5), i.e. ? = 243
- 3. What will come in place of the question mark in the series below? 2, 17, 89, 359, 1079, ?
Options- A. 2137
- B. 2121
- C. 2377
- D. 2159 Also asked in: AIEEE, Bank Exams, GATE
Correct Answer: 2159
Explanation:
Ans.
17 = 2 x 6 + 5
89 = 17 x 5 + 4
359 = 89 x 4 + 3
1079 = 359 x 3 + 2
? = 1079 x 2 + 1, i.e. ? = 2159
- 4. How many numbers are there from 300 to 650 which are completely divisible by both 5 and 7?
Options- A. 8
- B. 9
- C. 10
- D. 12 Also asked in: AIEEE, Bank Exams, CAT
Correct Answer: 10
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