To get the product 1 , we should multiply

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Question:
To get the product 1 , we should multiply $(8 / 21)$ by

(a) $8 / 21$

(b) $-8 / 21$

(c) $21 / 8$

(d) $-21 / 8$

Solution:

Because,

$=(8 / 21) \times(21 / 8)$

$=(8 \times 21) /(21 \times 8)$

$=168 / 168$

$=1$