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Rashmi Bajpayee 7 years, 1 month ago
Sn = 3n2/2 + 13n/2
S1 = a = 3/2 + 13/2 = 8
S2 = a + a2 = 12/2 + 26/2 = 19
a2 = 19 - 8 = 11
Then,. d = 11 -8 = 3
Now, a25 = a +(25 - 1)d
= 8 + 24 × 3
= 80
The 25th term is 80
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