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The number of 5 digits numbers that cont...

The number of 5 digits numbers that contain 7 exactly once is

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The number of four-digit numbers that can be made with the digits 1, 2, 3, 4, and 5 in which at least two digits are identical is a. 4^5-5! b. 505 c. 600 d. none of these

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CENGAGE PUBLICATION-PERMUTATIONS AND COMBINATIONS-All Questions
  1. The number less than 1000 that can be formed using the digits 0, 1,...

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  2. A variable name in certain computer language must be either an alph...

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  3. The number of 5 digits numbers that contain 7 exactly once is

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  4. The total number of flags with three horizontal strips in order, whi...

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  5. Let A be a set of n(ge 3) distinct elements. The number of triplets (x...

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  6. The number of possible outcomes in a throw of n ordinary dice in wh...

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  7. In a room there are 12 bulbs of the same wattage, each having separate...

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  8. In a city no two persons have identical set of teeth and there is n...

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  9. Consider the five points comprising the vertices of a square and th...

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  10. The letters of the word COCHIN are permuted and all the permutations a...

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  11. There are 3 men and 7 women taking a dance class. If N ils number ...

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  12. Let S={1, 2, 3, 4} . The total number of unordered pairs of disjoint ...

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  13. Number of permutations of 1, 2, 3, 4, 5, 6, 7, 8, and 9 taken all a...

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  14. The number of distinct natural numbers up to a maximum of four digi...

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  15. In a three-storey building, there are four rooms on the ground floo...

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  16. Find 6C2

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  17. The number of three-digit numbers having only two consecutive digit...

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  18. Number of four-digit numbers of the form N=a b c d which satisfy fol...

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  19. Find the number of ways in which 5A^(prime)s and 6B ' s can be arrange...

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  20. If N is the number of different paths of length-12 which leads from ...

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