If for a given AP a=7and a13=35 then find S13
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12d=28
d=7/3
S13= 13/2×(14+12×7/3)
=13/2×42
=13×21
= 273
d=7/3
S13= 13/2×(14+12×7/3)
=13/2×42
=13×21
= 273
shivam10sep:
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