what is the sum of firs 10 natural number
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The series of first 10 natural numbers is an arithmetic progressions with first tern as 1 and common difference So the sum of the series will be Sn = n/2 (2a+ (n-1) d) where n is the number of terms in the series, a is the first term and d is the common difference.
S10= 10/2 (2(1) + (10-1) 1)
= 5 (2+9)
= 5(11)
= 55
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