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Question

If a:b=2:3 and b:c=4:7 then the reciprocal ratio of a:c is ____

A
8:21
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B
21:8
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C
7:4
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D
3:2
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Solution

The correct option is C 21:8
a:b=2:3 and b:c=4:7
a:c=ab×bc=23×47
=821
a:c=8:21
The reciprocal ratio of a:c is 21:8.

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