find the sum of natural numbers from 21 to 80 {arithmetic Progression} class 10
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Answer:
21,22,23_------------80
a=21 d =1 ,an = 80
an = a+(n-1)d
80= 21+(n-1)1
59 = (n-1)
60 = n
s60= 60/2(2*21+(60-1)1
s60= 30(42+59)
s60= 30(101)
s60 = 3030
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