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B
55
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C
50
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D
90
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Solution
The correct option is B 55 The series of first 10 natural numbers is an arithmetic progressions with first tern as 1 and common difference 1. 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.