A teacher was trying to form the groups of students in such a way that every group has equal number of students and that number should be a prime number. She tried for first 5 prime numbers, but on each occasion exactly one student was left behind. If t
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Ram buys 7 novels from a book fair. Shyam buys 8 novels from the fair, none of which is common with those bought by Ram. They decide to exchange their books one for one. In how many ways can they exchange their books for the first time ? |
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In an examination 10 questions are to be answered choosing at least 4 from each of part A and part B. If there are 6 questions in part A and 7 in part B, in how many ways can 10 questions be answered ? |
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A box contains 20 tickets of identical appearance, the tickets being numbered 1, 2, 3, ….., 20. In how many ways can 3 tickets be chosen such that the numbers on the drawn tickets are in arithmetic progression ? |
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A company could advertise about its new product in 4 magazines, 3 newspapers and 2 television channels. But in a later move it decided to give advertisements in only 2 of the magazines, one of the newspapers and one the TV channels. In how many ways can |
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In how many ways can the letters of the word ERGONOMICS be rearranged such that the vowels always appear together? |
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How many different four letter words can be formed (the words need not be meaningful) using the letters of the word PACIFIC such that the first letter is P and the last letter is F? |
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The value of 74P2 is |
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In how many different ways can the letters of the word HARDWARE be arranged in such a way that the vowels always come together. |
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In how many ways a committee, consisting of 4 men and 10 women can be formed from 6 men and 10 women? |
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Out of 7 consonants and four vowels ,how many words of three consonants and 2 vowels can be formed? |
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