Solution
it's an alternate series of 5 and 7 in following pattern,
$$5,\ 5^2=25,\ 5^3=125,......$$
and
$$7,\ 7^2=49,\ 7^3=343,......$$
C is correct choice.
Get AI Help?
Create a FREE account and get:
- Download RRB Study Material PDF
- 45+ RRB previous papers with solutions PDF
- 300+ Online RRB Tests for Free
