Question:
Mark (✓) against the correct answer
Which of the following numbers is a perfect cube?
(a) 121
(b) 169
(c) 196
(d) 216
Solution:
(d) 216
$121=11 \times 11$
$169=13 \times 13$
$196=7 \times 7 \times 2 \times 2$
$216=2 \times 2 \times 2 \times 3 \times 3 \times 3=(2)^{3} \times(3)^{3}=(6)^{3}$
$216=6^{3}$
Hence, 216 is a perfect cube.
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