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Rahul's father wants to deposit some amo...

Rahul's father wants to deposit some amount of money every year on the day of Rahul's birthday. On his `1^(st)` birthday Rs.100, on his birthday Rs.300, on his `3^(rd)` birthday Rs.600, on his birthday Rs.1000 and so on. What is the amount deposited by his father on Rahul's 15^(th)` birthday?

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The correct Answer is:
Rs. 12000
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