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Convert 101101two to a number in base ten - WAEC Mathematics 2005 Question

Convert 101101two to a number in base ten
A
61
B
46
C
45
D
44
correct option: c
1011012 = 1 x 25 + 0 x 24 + 1 x 23 + 1 x 22 + 0 x 21 + 1 x 20 = 32 + 0 + 8 + 4 + 0 + 1 = 4510
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