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Re: Car X can come with any of these 5 additional features: sunr [#permalink]
Hamzaa wrote:
Hi,
Can anyone draw the tree for stages? How it goes upto 5 stages?
0 features: 0C5 = 1
1 feature: 1C5 = 5
2 features: 2C5 = 10
3 features: 3C5 = 10
4 features: 4C5 = 5
5 features: 5C5 = 1


There are five stages because there are five features that can be added to the car.
For each feature, we can either have the feature or not have the feature (so there are two ways to complete each stage)

Your solution is also valid (except the combinations are written backwards. It should be 5C2, not 2C5.

In fact, your solution brings up a useful property.
Notice that 5C0 + 5C1 + 5C2 + 5C3 + 5C4 + 5C5 = 2^5 = 32

In general, nC0 + nC1 + nC2 + nC3 + . . . . + nCn = 2^n
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Car X can come with any of these 5 additional features: sunroof, stere [#permalink]
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Car X can come with any of these 5 additional features: sunroof, stereo, tinted windows, leather seats and cruise control.


Quantity A
Quantity B
Number of different combinations possible
25



A. Quantity A is greater
B. Quantity B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given

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Car X can come with any of these 5 additional features: sunroof, stere [#permalink]
2
Approach-1

5c0+5c1+5c2+5c3+5c4+5c5 = 32

Approach-2:

2^5 = 32

Approach-3:

1+5+10+10+5+1 = 32

Answer: A
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Re: Car X can come with any of these 5 additional features: sunroof, stere [#permalink]
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Sir can u please confirm if its correct Carcass
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Re: Car X can come with any of these 5 additional features: sunroof, stere [#permalink]
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AkmKawser wrote:
Sir can u please confirm if its correct Carcass


All are fine but even a fraction of second is crucial to gain on the gRE

I would go with the second one, straight

I have or NOT have a feature. so 2 combination

2^5=32

regards
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Re: Car X can come with any of these 5 additional features: sunr [#permalink]
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Take it as a sets problem, how many sets are possible? 2**n = 2**5 = 32
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Re: Car X can come with any of these 5 additional features: sunr [#permalink]
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Re: Car X can come with any of these 5 additional features: sunr [#permalink]
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