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(a ) Find the sum of all 4 digit numbers that canbe formedusingthe digits 1,2,3,4 and 5 repetition not allowed ? (b ) Three vectorsvec (a) , vec(b) and vec(c )are such that|vec (a)| = 2 ,|vec(b)| = 3 ,|vec (c )| = 4 andvec(a)+vec(b ) + vec( c) = 0Find4vec (a ) .vec (b)+ 3vec(b) . vec(c ) +3 vec (c ) . vec(a) |
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Answer» =-42 |
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