determine the A.P as please answer
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third term = a+2d
a+2d =5 .....1
seventh term =a+6d
a+6d=9. ......2
Subtract equation 1 from 2
a+6d=9
-a-2d =-5
________
4d = 4
d=1
put value in equation 1
a+2×1=5
a+2=5
a=3
A.P.=3,4,5,6,7,8,9........
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