Given a=7a13=35 find d and s13
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Answer:
d=7/3 and s13=273
Step-by-step explanation:
35=7+(13-1)d
35-7=12d
28=12d
d=28/12
d=7/3
s13=13/2[2×7+(13-1)7/3]
= 13/2[14+28]
= 13/2×42
=13×21
= 273
hope it helps you
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