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Find d for an A.P. if (i) t(10) =20, t(9...

Find d for an A.P. if (i) `t_(10) =20, t_(9) = 18` (ii) `t_(n) = 7, t_(n-1) = 10`

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The correct Answer is:
(i) d=2 (ii) d= -3
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