If Ā=2i+3j+k and B=3i+2j+ 4k, then the value of (A + B)*(B - A) is (1) 10(2i+j+k)
(2) 10(2i-j- k)
(3) 20(i+j-k)
(4) 10(i+2j-2k)
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If Ā=2i+3j+k and B=3i+2j+ 4k, then the value of (A + B)*(B - A) is (1) 10(2i+j+k)
(2) 10(2i-j- k)
(3) 20(i+j-k)
(4) 10(i+2j-2k)
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