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Let veca, vecb, vecc be three vectors of...

Let `veca, vecb, vecc` be three vectors of magntiude 3, 4, 5 respectively, satisfying `| [[veca, vecb, vecc]] |=60.` If `(veca+2vecb+3vecc).((vecaxxvecc)xxvecb+vecb)=lambda` then `lambda` is equal to

A

16

B

32

C

20

D

40

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B
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