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Sum of n terms - 7n+1 : 4n+27
Sum of 1 terms - 7(1) + 1 : 4(1) + 27
=> 8:31
Therefore, a = 8 and A = 31
Sum of 2 terms - 7(2) + 1: 4(2) + 27
=> 15:35
Therefore, d= 15 - 8 = 7 and D = 35 - 31 = 4.
a of m : A of m
=> a + (m-1)d : A + (m-1)D
=> 8 + (m-1)*7 : 31 + (m-1)*4
=>8 + 7m-1 : 31 + 4m -4
=> 7(1+m): 27 + 4m
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