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In base ten, the number 101101 (base 2) equals

Mathematics
JAMB 1979

In base ten, the number 101101 (base 2) equals

  • A. 15
  • B. 4
  • C. 45
  • D. 32
  • E. 90
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Correct Answer: Option C
Explanation

(101101)2 \(\begin{array}{c|c} 2^5 & 2^4 & 2^3 & 2^2 & 2^1 & 2^o\\ \hline 1 & 0 & 1 & 1 & 0 & 1\end{array}\)

= 1 x 25 + 0 x 24 + 1 x 23 + 1 x 22 + 0 x 21 + 1 x 2o

= 32 + 0 + 8 + 4 + 0 + 1

= (45)\(_{10}\)


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