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Common difference of an A.P. is always p...

Common difference of an A.P. is always positive.

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The first term, last term and common difference of an A.P. are respectively a, b and 1. Prove that the sum of this A.P. is (1)/(2)(a+b)(1-a+b) .

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What is the common difference of an A.P. is 2 in which a_(11) - a_(7) ?

The common difference of an A.P. 6, then a_(15) - a_(11) …….. .

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Find the common difference of the A.P., if a=100and t_(20)=176 .