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How many terms of AP - 6 -11//2,-5 . . ...

How many terms of AP - 6 ` -11//2,-5 . . . ` are needed to give the sum - 25 ?

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OSWAAL PUBLICATION-SOLVED PAPER 2017-1-EXERCISE
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  10. Prove that underset(xrarr0)lim(sinx/x=1) ?

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