What is the binary equivalent of the decimal number (25)10 ?

2026

Answer: C. (11001)2 — 25 in binary is 11001. Divide by 2 repeatedly: 25/2=12 r1, 12/2=6 r0, 6/2=3 r0, 3/2=1 r1, 1/2=0 r1. Read remainders bottom-up.

1. A.

   (11011)2

2. B.

   (10011)2

3. C.

   (11001)2

4. D.

   (10001)2

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