Question

d=2
Sn=49

7th - 13
N = ?​

Answer 1

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Answer 2

7th term= a + 6d

13= a + 6×2

13= a+ 12

13-12= a

a=1

Sn=n/2 {2a+(n-1)d}

49=n/2{2×1+(n-1)2}

49×2=n{2+2n-2}

98=2n^2

49=n^2

n=7

hence,the value of 'n' is 7....