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Step-by-step explanation:
A(3) = a + 2d = 5 ---------(1)
A(7) = a + 6d = 9 ---------(2)
from equation (2) - (1)
4d = 4
d = 1
then , a = 5 - 2 = 3
So , the A.P. : 3 , 4 , 5 , 6 , 7 , 8 , 9,...
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