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 Flower planting

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BhandarkarA

BhandarkarA


Posts : 85
Join date : 2009-09-11

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PostSubject: Flower planting   Flower planting EmptyFri Sep 11, 2009 9:24 pm
On day one, Ranvir plants 1 flower. On day two, she plants 2 additonal flowers. This continues on where on day n, she has planted n more additional flowers. How many total flowers has she planted at the end of day 7?

flower
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Sreya Atluri




Posts : 6
Join date : 2009-09-12

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PostSubject: Re: Flower planting   Flower planting EmptySun Sep 13, 2009 7:19 pm
Hey Everyone,

I got 28 as the answer to this problem. This is how I solved it:

1 flower (1st day)
+ 2 flowers (2nd day)
+ 3 flowers (3rd day)
+ 4 flowers (4th day)
+ 5 flowers (5th day)
+ 6 flowers (6th day)
+ 7 flowers (7th day)

which by using (n*(n+1))/2= 56/2= 28.

Sincerely,
Sreya Atluri
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