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 169

How many such 5s are there in the above arrangement each of which is immediately preceded by an odd digit and immediately followed by an even digit ?

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

5's which are immediately preceded by an odd digit and immediately followed by an even digit

= (odd) (5) (even)

= 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 are 3 such 5's.

=> Ans - (D)

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