Discussion
In these series given below, how many 8s are there each of which is exactly divisible by its immediately preceding as well as succeeding numbers?
2 8 3 8 2 4 8 2 4 8 6 8 2 8 2 4 8 3 8 2 8 6
Answer: B
Correct answer: Two
An 8 qualifies only if both its neighbours divide it exactly, so both must be among 1, 2, 4 and 8. Two do: the 8 standing between 4 and 2, and the 8 standing between 2 and 2. The rest have a 3 or a 6 on one side, and neither divides 8. So the answer is two.
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