Question
The sum of all even numbers between 31 and 61
isSolution
Sum of first n even numbers = n (n + 1) Required sum = Sum of 30 even numbers from 1 to 60 – sum of 15 even numbers from 1 to 30 = 30 × 31 – 15 × 16 = 930 – 240 = 690
Given below are two statements
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