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If a^3+b^3=217 and a+b=7, then the value...

If `a^3+b^3=217` and a+b=7, then the value of ab is:
यदि `a^3+b^3=217` और a+b=7 तो ab का मान ज्ञात करें:

A

6

B

`-1`

C

`-6`

D

7

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