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

In base ten, the number 101101 (base 2) equals
  • A.
    15
  • B.
    4
  • C.
    45
  • D.
    32
  • E.
    90
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 & 1end{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