GMAT
Exam
Numerical Ability
Permutation and Combination
I have 2 slices of bread made of wheat and 2 slices of bread made of Rye (4 slices of bread in total). How many different types of sandwiches can be made ?
Read Solution (Total 6)
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- in 4 ways.
2 wheat breads can be placed in 2ways.
2rye breads in 2 ways.
total=4ways - 11 years agoHelpfull: Yes(0) No(4)
- total=8
2+2=4
4+4=8 - 10 years agoHelpfull: Yes(0) No(0)
- I ain't sure about the ans.
But it can be made in 12 different ways.
--- ---
1 2
1st place has 4 options
2nd place has 3 options
as the sandwich can be of the same bread slices or a combo of both.
- 10 years agoHelpfull: Yes(0) No(0)
- mathematically, 4c1*3c1=12. but categorically 3, wheat-wheat, rye-rye, rye-wheat
- 10 years agoHelpfull: Yes(0) No(1)
- 2 different types of sandwiches.
there is only wheat and rye. - 10 years agoHelpfull: Yes(0) No(1)
- 1st way
w w
w r
r r Total 3 ways
2nd way using formula
(4P2)/2!*2!
=12/4
=3
as there are 2 Wheat Bread and 2 Rye Bread so repitation so divide them - 6 years agoHelpfull: Yes(0) No(0)
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