Question

Count each $7$ which is not immediately preceded by $5$ but is immediately followed by either $2$ or $3$. How many such $7^{\prime }s$ are there?
$57265738373257273482678$

• A. $2$
• B. $3$
• C. $4$
• D. $5$

Answer 1

Answer: (A)

$2$

Given series is:

$57265738\underset{–}{373}257\underset{–}{273}482678$

Only two occurrences exist which satisfy the given conditions.

Hence, option A.