In an AP, given a=7, a
13
=35, find d and S
13
.
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Answered by
2
Answer:
In an AP, given a=7, a 13. =35, find d and S13
a=7,a 13
=35
a13. =a+(13−1)d
35=7+12d
28=12d
d=28/12=7/3 s13
= 213 [2a+(13−1) 37 ]
s13 = 213 [14+(12) 37 ]
s 13 = 213 [14+28]
s13=13×21
s13=273
Answered by
0
Answer:
In an AP, given a=7, a 13. =35, find d and S13
d=28/12=7/3 s13
= 213 [2a+(13−1) 37 ]
s13 = 213 [14+(12) 37 ]
s 13 = 213 [14+28]
s13=13×21
s13=273
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