Question 180
How many such 6s are there in the following number series, each of which is immediately preceded by 1 or 5 and immediately by 3 or 9?
2 6 3 7 5 6 4 2 9 6 1 3 4 1 63 9 1 5 6 9 2 3 1 6 5 4 3 2 1 9 6 7 1 6 3
Solution
6's which are immediately preceded by 1 or 5 and immediately by 3 or 9 = (1/5) (6) (3/9)
2 6 3 7 5 6 4 2 9 6 1 3 4 1 6 3 9 1 5 6 9 2 3 1 6 5 4 3 2 1 9 6 7 1 6 3
Thus, there are three such 6's.
=> Ans - (D)
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