If sum of n terms of an ap is 3n²+5n then which term of its term is 164
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Answer:
27th term
Step-by-step explanation:
s(n) = 3n²+5n
nth term = s(n) - s(n-1)
Un = 3n²+ 5n - 3(n-1)²- 5(n-1)
Un = 6n +2
6n +2 = 164
6n = 162
n = 162/6 = 27
it's the 27th term
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