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Find the number of diagonals in a polygo...

Find the number of diagonals in a polygon with n sides.

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  2. The number of polynomials of the form x^3 + ax^2 + bx + c which are di...

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  3. Find the number of diagonals in a polygon with n sides.

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  4. Find the total number of n -digit number (n >1) having property that n...

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  5. Prove that (n !)^2 < n^n n! < (2n)!, for all positive integers n.

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  6. Find the sum of the series sum(r=1)^n r/((r+1) !)dot

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  7. Find the exponent of 80 in 200!.

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  8. Prove that .^nPr = ^(n-1)Pr + r^(n-1)P(r-1)

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  12. Find the three-digit odd numbers that can be formed by using the digit...

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