While adding the first few continuous natural numbers, a candidate missed one of the numbers and wrote the answer as 177. What was the number missed ?

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Q: 70 (IAS/2009)
While adding the first few continuous natural numbers, a candidate missed one of the numbers and wrote the answer as 177. What was the number missed ?
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question_subject: 

Maths

question_exam: 

IAS

stats: 

0,8,18,7,6,8,5

keywords: 

{'first few continuous natural numbers': [0, 0, 1, 0], 'numbers': [0, 1, 0, 0], 'number': [0, 0, 0, 2]}