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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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  14. The number 916238457 is an example of a nine-digit number which con...

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  15. In a Delta ABC, Prove that, CosA/a+CosB/b+CosC/c = (a^2+b^2+c^2)/2

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

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