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15. Let a=1+j-k and c=21-3j+2k. Then the number of vectors b such that bc= and b = {1,.......10} is : (a) 0 (b) 1

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15. Let a=1+j-k and c=21-3j+2k. Then the number of vectors b such that bc= and b = {1,.......10} is : (a) 0 (b) 1 (c) 2 (d) 3 16. Five numbers X1, X2, X3, X4, X5 are randomly selected from the numbers 1, 2, 3,....., 18 and are arranged in the increasing order (x

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