<PRE><B>Question 1201456</B>
Find the sum of the first 103term of 18,26,34. .

26-18=8

34-26 =8

The difference between two consedutive term is 8

So the sequence is an AP

Sum of n terms of AP formula {{{ Sn = (n/2)*(2*a +(n-1)*d)}}}3
n=103
a first term = 18
d=8

S103 = (103/2)* (2*18 +(103-1)*8

= (103/2)*(36 + 102*8)

= (103/2)*852

= 43,878 the sum of the first 103 terms



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