How many terms ofAp.9,17,25 must be taken so thier sum is 636
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a=9
d=17-9=8
n=?
a+( n-1)d
9+(n-1)8=25-9
(n-1)8=16
n-1=16÷8=2
n=3
d=17-9=8
n=?
a+( n-1)d
9+(n-1)8=25-9
(n-1)8=16
n-1=16÷8=2
n=3
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