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a, b, c are three positive numbers, such...

a, b, c are three positive numbers, such that, `(a+b+c) = 20, a^(2) + b^(2) + c^(2) = 152`. The value of `(ab + bc + ca)` is equal to -

A

124

B

110

C

112

D

102

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The correct Answer is:
A
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