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2015-05-27T19:50:15+05:30

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To get the product 1 , we should multiply 8/21 by 21/8 i.e (c).

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2015-05-28T01:23:53+05:30
To get the product 1, we should multiply 8/21 by 21/8 (c)
because the product of any number with its reciprocal results 1.
So, the option (c) 21/8 is the answer.
1 5 1