Question

In the following series of numbers, find out how many times, 1, 3 and 7 have appeared together, 7 being in the middle and 1 and 3 on either side of 7?
2973173771331738571377173906

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

Answer: (C)

Three

As given in the problem we have to find the pattern of the form 173 or 371.

$2973\underset{–}{173}77133\underset{–}{173}8571377\underset{–}{173}906$

There are three pairs.

option C