JAMB - Mathematics (1981 - No. 27)
The number 25 when converted from the tens and units base to the binary base (base two) is one of the following
10011
111011
111000
11001
110011
Forklaring
\(\begin{array}{c|c} 2 & 25\\2 & 12 R 1\\2 & 6 R 0\\2 & 3 R 0\\2 & 1 R 1\\2&0 R 1\end{array}\)
= (11001)
= (11001)