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.
So the sum =
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