a=7 a13=35diya hai.d aur s13 gyat kijiye.
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A [ First term ] = 7
A13 = 35
A + 12 d = 35
7 + 12d = 35
12d = 28
d=2
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S13 = 13/2 { 14 + 12×2}
= 13/2 { 14 + 24 ]
13/2 × 38
19× 13
=247.
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