Question

How many $7^{\prime }s$ immediately preceded by $6$ but not immediately followed by $4$ are there in the following series?

$642367589672134$

• A. $1\left(one\right)$
• B. $2\left(two\right)$
• C. $4\left(four\right)$
• D. $6\left(six\right)$

Answer 1

Answer: (B)

$2\left(two\right)$

Pairs are $675$ and $672$.