The value of 75P2
5450
5555
5550
5656
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1
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A, B, C, and D are four points, any three of which are non-collinear. Then, the number of ways to construct three lines each joining a pair of points so that the lines do not form a triangle is
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2
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Three chairs are arranged in a row facing three other chairs. 4 boys and 2 girls are to be seated on these chairs such that girls are always facing each other. In how many ways can they be seated?
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3
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If (n + 2)! = 2550 (n!); find ’n’
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4
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The number of circles that can be drawn out of 10 points of which 7 are collinear is
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5
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Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?
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6
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In how many ways the letters of the word “UNDERDOG” can be arranged such that the first and last letters are same and no two vowels are together?
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7
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How many four-digit numbers, each divisible by 4 can be formed using the digits 5, 6, 7, 8, 9, repetition of digits being allowed in any number?
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8
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How many words can be formed from the letters of the word "SIGNATURE" so that vowels always come together.
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9
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Three unbiased coins are tossed. What is the probability of getting at most two heads ?
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10
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If P(A)=2/5, P(B)=3/10 and P(A ∩ B) =51, then P(A' | B'). P(B' | A') is equal to
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