
Find the sum of the first 100 odd natural numbers

Answer to Problem 41PPS
The sum first 100 odd terms is 10000.
Explanation of Solution
Given:
Find the sum of the first 100 odd natural numbers
Concept Used:
The general formula for sum of arithmetic series is: Sn = n2 [2a1+(n−1) · d ]
If nth term is given, then the formula: Sn = n2 (a1+an)
Calculation:
The series: 1,3,5,......100 odd terms
a1=1 and d=3−1=2, n=100
a1=1 and d=2, n=100 ; find SnSn = n2 [2a1+(n−1) · d ] Sn = 1002 [2 · 1+(100−1) · 2 ] Sn=50 [ 2+198] = 50 · 200=10000Sn=10000
Thus, the sum first 100 odd terms is 10000.
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Algebra 2
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