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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?
- A3
- B2
- C7
- D8
Answer not set
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CCommunity
Sum of all natural numbers from 1 to 12 = 78
By adding a number twice sum becomes 80
∴ the number which is added twice = 80 - 78 = 2
By adding a number twice sum becomes 80
∴ the number which is added twice = 80 - 78 = 2