Please enter the following details
Free Daily Targets & Mocks
Study Material & Formulas PDFs
1 on 1 Mentorship
Question 104
A boy added all natural numbers from 1 to 12, however he added one number twice due to which the sum becomes 80. What is the number which he
added twice?
Solution
Sum of first $$'n'$$ natural numbers = $$\frac{n(n+1)}{2}$$
=> Sum of first 12 natural numbers = $$\frac{12(12+1)}{2}=78$$
Thus, number that was added twice = $$80-78=2$$
=> Ans - (B)
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
