prove that SUM OF nC0- nC1+nC2- nC3+ -----+(-1)^r .nCr =(-1)^r . (n-1)Cr

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there are 6 rows of six points which are equally spaced.find no. of straight lines and triangles.

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IF ROOTS OF THE EQUATION a x^3 + bx^2 - x + 1 = 0 are in H.P , then value of I b max / a min I

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