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In a certain city, all telephone numbers...

In a certain city, all telephone numbers have six digits, the first two digits always being 41 or 42 or 46 or 62 or 64. How many telephone numbers have all six digits distinct ?

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MODERN PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXERCISE
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  2. How many 5-digit telephone numbers can be constructed using the digits...

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  3. In a certain city, all telephone numbers have six digits, the first tw...

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  7. In how many ways can 5 boys and 3 girls sit in a row so that no two gi...

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  8. In how many ways can 4 boys and 3 girls be seated in a row so that no ...

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  14. How many 3-letter words can be made using the letters of the word ‘ORI...

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  15. How many words, with or without meaning, each of 3 vowels and 2 conson...

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  16. How many words can be formed out of the letters of the word ‘ARTICLE’ ...

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  17. In how many ways can the letters of the word ‘PENCIL’ be arranged so t...

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  18. In how many ways can 5 children be arranged in a line such that : two ...

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  19. In how many ways can 5 girls be seated in a row so that two girls Ridh...

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