find the sum of first 25 terms of ap 3,7,11,15....ans is 1275
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Answer:
S25= 1275
Explanation:
a=3
d=4
n=25
Sn=n/2*(2a+(n-1)d)
S25=25/2 *(6+24*4)
=25/2*(6+96)
=25/2*102
=25*51
=1275
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