in ap a=7a13 =35 find d and s 13
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If a=7 and a13=35 then
a+12d=35
7+12d=35
12d=35-7
12d=28
D=28/12=7/3
Hence d=7/3
For s13=n/2{2a+(n-1)d}
13/2{14+(13-1)7/3
13/2{14+12*7/3}
13/2{126/3}
1638/6
273 ans
a+12d=35
7+12d=35
12d=35-7
12d=28
D=28/12=7/3
Hence d=7/3
For s13=n/2{2a+(n-1)d}
13/2{14+(13-1)7/3
13/2{14+12*7/3}
13/2{126/3}
1638/6
273 ans
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