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Find the total number of rectangles on the normal chessboard.

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

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

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  10. In how many ways the letters of the word COMBINATORICS can be arran...

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  12. Find the number of all three elements subsets of the set{a1, a2, a3, ....

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  13. A bag contains 50 tickets numbered 1, 2, 3, .., 50 of which five are d...

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  14. Four visitors A, B, C, D arrived at a town that has 5 hotels. In how ...

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  15. about to only mathematics

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