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Find tire surn.ĺ.the .teltcto na A.P |
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Answer» First term = a₁ = 1 Second term = a₂ = 3 Common difference = d =a₂- a₁ = 3 - 1 = 2 Last term = an = 199 an = a+ (n-1)d199 = 1 + (n-1)2198 = (n-1)2198/2 = n - 199 = n - 1n = 100 No: of terms = n = 100 Sum = Sn Sn = n/2 [a + an] = 100/2 [ 1 + 199] = 50 [ 200] = 10000 Sum = 10000 |
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