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q54

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q54

54Find the value of 9 + 10 + 11 + 12 + , .. + 2l.

A
190
B
231
C
196
D
215

Answer
Comment

Option : C
Explanation : 9 + 10 + 11 + ... + 21 =(1+ 2+ ... + 21)-(1+ 2+ ... + 8)

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