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If 16Pr1: 15Pr1 = 16: 7, at that point discover r.

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In a province, there are 55 individuals. Each part presents a welcome card for all the individuals. What number of welcome cards were posted by them?

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Locate the number of methods of orchestrating the letters of the words DANGER, with the goal that no vowel possesses an odd spot.

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Discover the amount of each of the four-digit numbers that can be shaped by the digits 1, 3, 5, 7, 9 without reiteration.

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If that point discovers RSS n and r.

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Locate the number of square shapes and squares in an 8 by 8chessboardd separately.

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There are 20 focuses in a plane, what number of triangles can be shaped by these focuses if 5 are collinear?

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From multiple points of view would we be able to choose 6 individuals out of 10, of which a specific individual is excluded?

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Number of round permutations of various things taken all at a time is n!.

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Is the given assertion valid or bogus? nCr= can-r

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