The reciprocal of
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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