Which of the following is equal to 45?

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From a group of 7 men and 6 women, five persons are to be selected to form a committee so that at least 3 men are there on the committee. In how many ways can it be done?

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Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is ---

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f(x) = -1, for all x>0. If f(a) = -1 and f(ab) = -1 then b = ?

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