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Like a×b matrix, can we have a1×a2×..×aN multi dimensional matrix? Does Saudi Arabia use more intensive or extensive agriculture? show : ζ(-1) = - 1/12 .? How many chlorine atoms are in 0.650 mol of Ca(ClO4)2? Sara has 20 sweets they are: 12 Liquorice, 5 mint, 3 humbugs. she takes 2.What is the probability that the 2 sweets will not be the same?