NDA Government Jobs Exams

If P(77, 31) = x and C(77, 31) = y, then which one of the following is correct ?
(a) x = y (b) 2x = y (c) 77x = 31y (d) x > y

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NDA Other Question

A bag contains balls of two colours, 3 black and 3 white. What is the smallest number of balls which must be
drawn from the bag, without looking, so that among these there are two of the same colour The binary representation of the decimal number 45 is
(a) 110011 (b) 101010 (c) 1101101 (d) 101101