sn is given method to find an
(1) s.n=n²+2n ,find value of a10
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Answer:
a(10) = 57
Step-by-step explanation:
s.n= n²+2n. {given}
a(10)= s(10)-s(9)
= 10²+2(10). - 9²+2(9)
= 100+20. - 81+18
= 120 - 63
a(10) = 57
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