Question

Convert the binary equivalent 10101 to its decimal equivalent.

Answer 1

Correct answer is (a) 21

To explain: To convert a binary number to its decimal equivalent follow these steps :

2^4 * 1  + 2^3 * 0 + 2^2 *1 + 2^1 * 0 + 2^0 * 1 = 21.

Therefore, the answer is 21.