Question

Mr and Mrs Krishnan are eating ice cream. Mrs Krishnan says that if her husband
gives her one scoop of his ice cream she'll have thrice as many scoops as him. Mr
Krishnan says that if she gives him two of her scoops, they both will have the same
amount of scoops. How many scoops do they each have?​

Answer 1

Answer:

There are five flavors of icecream: banana, chocolate, lemon, strawberry and vanilla. You can have three scoops. How many variations will there be? (flavors cannot be repeated)

Answer

5C3 = 5!/(3! x 2!) = 10

Question 2

There are five flavors of icecream: banana, chocolate, lemon, strawberry and vanilla. You can have three scoops. How many variations will there be? (flavors can be repeated)

Answer

5 x 5 x 5 = 125

Question 3

There are five flavors of icecream: banana, chocolate, lemon, strawberry and vanilla. You can have three scoops. How many variations will there be? (flavors can be repeated but order doesn't matter)

Answer

(5+3-1)! / [3! x (5-1)!] = 35

From GMAT point of view, you need to know only first and second questions.

I am sure, 3rd question is not from any reputed GMAT related material.

There are many things, Permutation with repetition, Permutation without repetition, Combination with repetition, Combination without repetition. GMAT doesn't ask all the things. This will become very very complicated.

Still if u want to do research on question number 3, you can do that (but not for your GMAT exam). This question is about "Combination without repetition". So, here we can do repetitions. But point to be noted is that it is a combination problem. So, order doesn't matter.

Normally, when we take 5^3, order matters. So, BBL and BLB are different possibilities. But in 3rd question, BBL & BLB are same only (because order doesn't matter). This way, we need to proceed.

Kudos

Explanation:

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