1969 AHSME Problems/Problem 3

Problem

If $N$ , written in base $2$ , is $11000$ , the integer immediately preceding $N$ , written in base $2$ , is:

$\text{(A) } 10001\quad \text{(B) } 10010\quad \text{(C) } 10011\quad \text{(D) } 10110\quad \text{(E) } 10111$

$11000_2-1_2=10111_2$ . $\fbox{E}$

1969 AHSC (Problems • Answer Key • Resources)
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