Bill is making a sandwich. he may choose a combination of the following: lettuce, tomato, carrot, cheese, cucumber, beetroot, onion and ham. Find the probability that the sandwich contains ham.

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- Nov 3rd 2008, 11:56 PMAltQQCombination help
Bill is making a sandwich. he may choose a combination of the following: lettuce, tomato, carrot, cheese, cucumber, beetroot, onion and ham. Find the probability that the sandwich contains ham.

- Nov 4th 2008, 02:06 AMmr fantastic
- Nov 4th 2008, 08:35 AMpankaj
Number of all possible combinations $\displaystyle =2^8-1=255$

If ham has to be included,this can be done in 1 way and the others can be chosen in $\displaystyle 2^7=128$ ways.

Required probability=$\displaystyle \frac{128}{255}$