If all the numbers from 1 to 61 which are divisible by 4 are arranged in…
2016
If all the numbers from 1 to 61 which are divisible by 4 are arranged in ascending position, then which number will be at 8th position from the lowest?
- A.
32
- B.
36
- C.
40
- D.
28
Attempted by 142 students.
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Correct answer: A
Short method: Numbers divisible by 4 from 1 to 61 form the sequence 4, 8, 12, ..., 60.
First term a1 = 4 and common difference d = 4.
General term formula: a_n = a1 + (n - 1) × d = 4 + (n - 1) × 4.
For n = 8: a_8 = 4 + 7 × 4 = 4 + 28 = 32.
Therefore, the 8th number from the lowest is 32.