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Question

Find the following product by using suitable identity
(3.29)3+(6.71)3

A
137.763
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B
337.723
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C
7437.778
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D
237.233
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Solution

The correct option is A 337.723
(3.29)3+(6.71)3
Using,(a3+b3)=(a+b)(a2ab+b2)
=(3.29+6.71)[(3.29)2(3.29)(6.71)+(6.71)2]
=10(10.824122.0759+45.0241)
=10(33.7723)
=337.723

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