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If veca = 2 hati - hatj + hatk , vecb...

If `veca = 2 hati - hatj + hatk , vecb = hati + hatj - 2 hatk, vecc= hati + 3 hatj- hatk, if veca` is perpendicular to `lamda vecb + vecc.` then the value of `lamda` is ________.

A

0

B

2

C

`-2`

D

3

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