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%?
0.648
0.234
0.348
.839
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What is the probability of getting at least one six in a single throw of three unbiased dice?s
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If ,, are probabilities of three mutually exclusive events, then
SolutionAnswer :1/2 
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How many numbers can be formed from 1, 2, 3, 4, 5 (without repetition), when the digit at the unit’s place must be greater than that in the ten’s place?
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4
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If A and B are two independent events with P(A) = 3/5 and P(B) = 4/9 , then P(A' ∩ B' ) equals
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5
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Two variants of the CAT paper are to be given to 12 students. In how many ways can the students be placed in two rows of six each so that there should be no identical variants side by side and that the students sitting one behind the other should have the same variant. Find the number of ways this can be done
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6
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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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7
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How many integers between 1000 and 10000 have no digits other than 4, 5, or 6?
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8
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If ^{18}C_{r }= ^{18}C_{r+2 }; find ^{r}C_{5}.
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9
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How many words can be formed from the letters of the word "SIGNATURE" so that vowels always come together.
Solution 
10
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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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