Question:
The reciprocal of $(-3 / 8) \times(-7 / 13)$ is
(a) $104 / 21$
(b) $-104 / 21$
(c) $21 / 104$
(d) $-21 / 104$
Solution:
(a) $104 / 21$
$=(-3 \times-7) /(8 \times 13)$
$=(21 / 104)$
Reciprocal of $21 / 104$ is $104 / 21$
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