alex lotel

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Posts: 191

posted 9 years ago

i got this question that i dond have any clue

what they want from me

it says:

build a method that takes two integer numbers

n>k>1

the method prints out all the subgroops

if the size of k

for example

subs(4,2)

prints

12,41,13,32,42,34

i cant find out was it the legality in these groops

because it meeses 22 31

??

what they want from me

it says:

build a method that takes two integer numbers

n>k>1

the method prints out all the subgroops

if the size of k

for example

subs(4,2)

prints

12,41,13,32,42,34

i cant find out was it the legality in these groops

because it meeses 22 31

??

posted 9 years ago

Welcome to the forum.

It appears that they are looking for the number of ways you can

In your example, '22' is disallowed because once '2' is picked from {1,2,3,4}, it cannot be selected again. Since we disregard arrangement, '31' is the same as '13', and '13' is a part of your "subgroup".

Am not sure if "subgroup" is a right terminology here, but I guess it depends upon the curriculum.

- Anand

It appears that they are looking for the number of ways you can

**select**'k' elements from 'n' elements (without considering*arrangement*). This is called COMBINATION (if arrangment is considered, it is called PERMUTATION).In your example, '22' is disallowed because once '2' is picked from {1,2,3,4}, it cannot be selected again. Since we disregard arrangement, '31' is the same as '13', and '13' is a part of your "subgroup".

Am not sure if "subgroup" is a right terminology here, but I guess it depends upon the curriculum.

- Anand

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