(1 + 3 + 5 +............. + 17) + ( 2 + 4 + 6........ + 18)
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The sum is 171.
Step-by-step explanation:
The expression is:
S = (1 + 3 + 5 +............. + 17) + ( 2 + 4 + 6........ + 18)
⇒ S = 1 + 2 + 3 + 4 + 5 + 6 + ... + 17 + 18
The series in an arithmetic progression.
The expression of S is the sum of first n = 18 terms with common difference, d = 1 and first term as a = 1.
Compute the value of S as follows:
Thus, the sum is 171.
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