In how many different ways can the letters of the word 'OPTICAL' be arranged so that the vowels always come together?
120
720
4320
2160
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1
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If 18Cr = 18Cr+2 ; find rC5.
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2
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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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3
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In how many ways a committee, consisting of 5 men and 6 women can be formed from 8 men and 10 women?
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4
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A fair coin is tossed 5 times. What is the probability of getting at least three heads on consecutive tosses?
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5
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There are three rooms in a motel: one single, one double, and one for four persons. How many ways are there to house seven persons in these rooms?
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6
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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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7
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Find the probability that a leap year selected at random will contain 53 Sundays
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8
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A committee of 8 members is to be selected from a group of 12 male and 10 female members. In how many ways the committee is selected such that at most two and at least one male member are there in the committee?
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9
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12 person are seated at a round table. Number of ways of selecting 2 persons not adjacent to each other is
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10
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In how many ways can 10 people line up at a ticket window of a railway station?
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