(111001)2
Explanation:
Given number is in base 2.
∴ (111001)2 = 1 × 25 + 1 × 24 + 1 × 23 + 0 × 22 + 0 × 21 + 1 × 20.
= 32 + 16 + 8 + 0 + 0 + 1 = 57.
Hence, 57.
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