On the first day, one penny. On the second day, 2 pennies. On the third day, 3 pennies... How much pennies will be saved in a year(365 days)?

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Number of pennies saved in a year=Sum of all the saved pennies =1+2+3+.........+365 pennies

So we have to add the number till 365.

We know that the sum of first n natural number is given by the formula n(n+1)/2.

Here n=365.

So the sum =

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