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NemiM [27]
3 years ago
15

A restaurant will select 1 card from a bowl to win a free lunch. Jo puts 5 cards in the bowl. The bowl has 100 cards. What are t

he odds of jo winning a free lunch?
A)1/5
B)1/10
C)1/20
D) 1/500
Mathematics
1 answer:
liraira [26]3 years ago
8 0

Answer:

1/20

Step-by-step explanation:

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Find the sum of the first one hundred positive integers. see fig 6.26
nignag [31]
Here's a pattern to consider:
1+100=101
2+99=101
3+98=101
4+97=101
5+96=101
.....
This question relates to the discovery of Gauss, a mathematician. He found out that if you split 100 from 1-50 and 51-100, you could add them from each end to get a sum of 101. As there are 50 sets of addition, then the total is 50×101=5050
So, the sum of the first 100 positive integers is 5050.

Quick note
We can use a formula to find out the sum of an arithmetic series:
s =  \frac{n(n + 1)}{2}
Where s is the sum of the series and n is the number of terms in the series. It works for the above problem.
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Vlad [161]
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Please help I'm so depressed:(
Mashcka [7]

omi god..... I used http://convert-to.com/202/speed-units.html and got

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