Question 83 (xii)

Multiply the following:
$- 7 s t, - 1, - 13 s t^{2}$

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Solution

We have, $- 7 s t, - 1 a n d - 13 s t^{2}$
$∴ - 7 s t \times (- 1) \times (- 13 s t^{2}) = [- 7 \times (- 1) \times (- 13)] s t \times (s t^{2}) = - 91 s^{2} t^{3}$

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