Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test Logical Reasoning Series Number Series
Select the number that can replace the question mark (?) in the given number series.
121, 57, 21, 5, ?
1
4
2
8
3
1
4
More than one of the above
5
None of the above