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If 9a^(2) + 16b^(2) + c^(2) + 25 = 24, (...

If `9a^(2) + 16b^(2) + c^(2) + 25 = 24, (a+b)`, then the value of `(3a + 4b + 5c)` is :

A

9

B

6

C

7

D

10

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