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यदि `veca=veci+vecj+2veck" और "vecb=3veci+2vecj-veck" तो "(veca+3vecb).(2veca-vecb)` का मान है-

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यदि `veca=veci+vecj+2veck" और "vecb=3veci+2vecj-veck" तो "(veca+3vecb).(2veca-vecb)` का मान है-
A. 15
B. 18
C. -18
D. -15
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Correct Answer - D
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