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# Sn= ( 5n^2 +5)/ (2), find 10^th term?

S10 = 5(10^2) + 5 / 2 = 5(100) + 5 / 2 = 500 +5 / 2 = 505/2 = 252.5  Kelvin Ejumevwo Oritsedere
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248 students helped

You could do S10 - S9 i.e. S10 = 252.5 S9 = 205 a10 = 252.5 - 205 = 47.5 So, its like adding 10 terms and subtracting the sum of 9 terms, giving you the 10th term  saumil doshi
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171 students helped

Here I am assuming that n on the left hand side of the equation is in subscript. Put n=10 in the given equation, we get S(10th)=(5(10)^2+5)/2 = 252.5  ·

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