If ^{18}C_{r }= ^{18}C_{r+2 }; find ^{r}C_{5}.
56
63
49
42
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1
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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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2
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How many fourdigit 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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3
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A biased coin in tossed thrice. What is the probability that heads turns out at least twice considering that the probability of a head is 60%?
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4
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Ten participants are participating in a competition. In how many ways can the first three prizes be won?
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5
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In how many different ways can the letters of the word 'CORPORATION' be arranged so that the vowels always come together?
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6
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In how many ways can the letters of the word 'LEADER' be arranged?
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7
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There are 20 people among whom two are sisters. Find the number of ways in which we can arrange them around a circle so that there is exactly one person between the two sisters.
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8
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In how many ways can a cricketer can score 200 runs with fours and sixes only?
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9
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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 three men are in the committee. In how many ways can it be done?
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10
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Find the probability that a leap year selected at random will contain 53 Sundays
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