How many ones are there in 3 × 512 + 7 × 64 + 5 × 8 +

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How many ones are there in
3 × 512 + 7 × 64 + 5 × 8 + 3

1. 8
2. 9
3. 10
4. 11

Correct Option: B

3 × 512 + 7 × 64 + 5 × 8 + 3
= 3 × 8³ + 7 × 8² + 5 × 8¹ + 3 × 8⁰
= (3753)₈
= (011 111 101 011)2 i.e., 9 1’s,
Hence alternative (B) is the correct choice.