Question

Convert the binary number 10101 to its base 10 equivalent.

12
21
22
31

Answer 1

`\\ \sf\Rrightarrow (10101)_2`

`\\ \sf\Rrightarrow 1* 2^0+0* 2^1+1* 2^2+0* 2^3+1* 2^4`

`\\ \sf\Rrightarrow 1+4+16`

`\\ \sf\Rrightarrow (21)_(10)`