3rd term of an Ap exesseds first term by 12 . 5th term is 25 find the sum of first term?
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According to the question,
a+2d-a=12( since the third term exceeds the first term by 12, the difference between the third and first term should be 12)
2d=12
d=6
a+4d=25
a+24=25
a=1
Sum of first term=first term=a=1
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