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Find the number of ways of selection of ...

Find the number of ways of selection of at least one vowel and one consonant from the word TRlPLE.

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  4. There are p copies each of n different books. Find the number of ways ...

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  15. There are 10 points on a plane of which 5 points are collinear. Also, ...

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  16. Find the total number of rectangles on the normal chessboard.

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  17. There are 10 points on a plane of which no three points are collinear....

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  19. m equi spaced horizontal lines are intersection by n equi spaced verti...

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