Question

please answer this question as an attachment
the 7th question​

Answer 1

Answer:

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Answer 2

Sum (1)

2n^n+5n

2×(1)^1+5(1)

7=a

Now if  d=2

Than

2(2)^2+5(2)

8+10

18

It means

t( 4th term)

a+(n-1)d

7+(4-1)2

7+3×18

61=t(4)