How many binary digits are needed to create 1024 combination

How many binary digits are needed to create 1024 combinations?

A. 8

B. 9           

C. 10

D. 11

Solution

C.10

10 binary digits give 1024 combinations as, 2¹⁰=1024.

Other options are wrong because:

2⁸=256

2⁹=512

2¹¹=2048