Instructions

Study the following arrangement carefully and answer the questions given below :
1 5 8 4 2 1 5 2 3 4 5 6 7 8 9 5 1 4 1 5 6 8 7 4

Question 90

How many such 1s are there in the above arrangement each of which is immediately followed by a perfect square ?

Solution

Arrangement : 1 5 8 4 2 1 5 2 3 4 5 6 7 8 9 5 1 4 1 5 6 8 7 4

1's which are immediately followed by a perfect square

= (1) (perfect square)

= 1 5 8 4 2 1 5 2 3 4 5 6 7 8 9 5 1 4 1 5 6 8 7 4

Thus, there is only one such 1.

=> Ans - (B)

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