Question

an = 4n ²-1 . Find 8th term​

Answer 1

Answer:

n term of AP is (4n+1)

1 term of AP is (4(1)+1)=5

2 term of AP is (4(2)+1)=9

3term of AP is (4(3)+1)=13

S 15 = 15/2 [2×5+(15−1)4]

=> 15/2 [10+56]= 15/2×6=225

Step-by-step explanation:

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