If sum of three terms of an AP is 21 then middle term is
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Answered by
2
Answer:
ap is
a-d
a
a+d
sum =a+ a+ a+ d- d
3a=21
a=7
terms 7-d
7
7+ d
middle term is 7
Answered by
6
Answer:
let 3 terms of an ap be a-d, a, a+d
then we have
a-d+a+a+d =21
3a=21
a=7
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