Question

if the sum of first n terms of an AP is (2n)square - n , find the 12 th term​

Answer 1

Answer:

(2n)^n=(2*12)^12

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Sn =2n^2-n

2(12)^2-12

2× 144-12 =276

Sn =276

for n=11

2×11^2-11

2×121-11 = 231

Sn= 231

tn =S12-S11 = 276-231 =45

12 term of ap 2n^2-n is 45