Question

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Ⓒⓗⓐⓟⓣⓔⓡ=>A.P


F̳i̳n̳d̳ t̳h̳e̳ s̳u̳m̳ o̳f̳ A̳.P̳


14,21,28,_,_,_,_,_,168.


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Answer 1

$an = a + (n - 1) \times d$

$168 = 14 + (n - 1) \times 7$

$168 - 14 = (n - 1) \times 7$

$154 = (n - 1) \times 7$

$154 \div 7 = (n - 1)$
22 = (n-1)
n = 23
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Answer 2

an =a+(n-1)d
168=14+(n-1)7
168=14+7n-7
168-7=7n
161=7n
n=23
now , we can find the sum..
sn=n/2(a+l)
=23/2(14+168)
=23/2(182)
=23×91
=2093