Question

concert the binary number (1001)2 in to decimal syetem​

Answer 1

supposing that the 2 was a typo, 1001 = 9

anynumber = sum of 2 power all (positions its in-1)

for example 1001⇒2pow3+2pow0=9

Answer 2

Answer:

The one which is done with pen is your answer.

Hope this will help you..

:)