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scoray [572]
3 years ago
10

Discrete Math HELP!

Mathematics
1 answer:
prohojiy [21]3 years ago
6 0

Answer with Step-by-step explanation:

1.Let p={Aaron , bob ,phill,john,chad}

Number of elements in set p=5

Formula : Number of subset of the set which contain n elements

2^n

Total number of subset =2^5=32

The subsets which  contain neither  Aaron nor  bob are

{phil},{john},{chad},\phi,{phil,john},{phil,chad},{john,chad},{phil,john,chad}

There are eight subsets which do not contain neither Aaron nor bob .

Answer given by the method 2^{5-2}=8

Where 5= Total number of elements

2= Number of elements in subsets which do not contain

Therefore,answer is correct.

2.A={1,2,3,4,5,6,7}

There are total seven elements

Therefore, total number of subsets =2^7

We have to find the number of subsets of A which include 2,4 and 6.

The number of subsets which contain {2,4, 6}

{2,4,6},{2,4,6,1},{2,4,6,3},{2,4,6,5},{2,4,6,7},{1,2,3,4,6},{1,2,4,5,6},{1,2,4,6,7},{2,4,5,6,7},{2,3,4,5,6},{2,3,4,6,7},{1,2,3,4,5,6},{2,3,4,5,6,7},{1,3,4,5,6,7},{1,2,4,5,6,7},{1,2,3,5,6,7},{1,2,3,4,5,7},{1,2,3,4,5,6,7}

Total number of subsets  which contain {2,4,6} are eighteen.

Answer  given by 2^{7-3}=2^4=16

The answer is false.

We can not use these method for calculating number of subsets which contain{2,4,6}.

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