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Given a=2 ,d=8, Sn=90, find a= ? and A9 |
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Answer» ONG>Step-by-step explanation: Here, Given : a = 2 d = 8 sn = 90 So, According to formula , Sn = a + ( 2d - a)d = A9 90 = 2 + ( 16 - 2) 8 90 = 2 + 128 - 16 90 = 130 -16 90A9= 114 A9 = 114/90 |
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