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The ratio of square of a number and the reciprocal of its cube is `243/16807`. What is the number?
किसी संख्या के वर्ग तथा इसके घन के पारस्परिक ( reciprocal ) का अनुपात `243/16807`है| यह संख्या कौन सी है?

A

`2/7`

B

`7/3`

C

`3/7`

D

`5/7`

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