If 6 @ 4 @ 7 = 109 and 2 @ 5 @ 11 = 150, then what is the va

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If 6 @ 4 @ 7 = 109 and 2 @ 5 @ 11 = 150, then what is the value of A in A @ 8 @ 9 = 289?

[2017 SSC CGL 11 AUG Shift 3]

A 5

B 8

C 12

D 17