If 1+2+….+k=55, then the value of k is - ProProfs Discuss
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If 1+2+….+k=55, then the value of k is



A. 10
B. 11
C. 12
D. 13

This question is part of Maths quiz for CBSE Class 10
Asked by Meyya on Jan 22, 2019

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1 Answer

meyya

Meyya

Answered on Jan 22, 2019

10

Sn = n(n+1)/2 55=k(k+1)/2. then k=10
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