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Q.

If a→=1,-1,2,b→=-2,3,5,c→=2,-2,4 and i^ is the unit  vector in the x -direction, then a→-2b→+3c→i^=

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a

11

b

15

c

18

d

36

answer is A.

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Detailed Solution

a→=1,−1,2,b→=−2,3,5,c→=2,−2,4So,a→=1,−1,2≡i^−j^+2k^;b^=−2,3,5≡−2i^+3j^+5k^and c→=2,−2,4≡2i^−2j^+4k^⇒a→−2b→+3c→=i^−j^+2k^−2−2k^+3j^+5k^+32i^−2j^+4k^=11i^−13j^+4k^ and a→−2b→+3ci^=11
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