sum of numbers from 31 ~ 120
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Sum of numbers from 31 ~ 120 is 6795
Step-by-step explanation:
Sum of all terms in a finite AP with the last term as 'l'
= n/2(a + l)
First term, a = 31
Last term, l = 120
Total number of term , n = 90
= 90/2 (31 + 120)
= 45 × 151
= 6795
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