Question 25 Assume we have 20 different covers that can be used for an i-phone, a Sumsung and a Nokia mobiles. How many different ways to cover these mobiles: P(20, 3) C(20, 3) 20+20+20 20*20*20

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Please Answer the following questions, Discrete mathematics 

Question 25
Assume we have 20 different covers that can be used for an i-phone, a Sumsung and a Nokia mobiles. How many different ways to cover these mobiles:
P(20, 3)
O (20, 3)
20+20+20
20*20*20
Transcribed Image Text:Question 25 Assume we have 20 different covers that can be used for an i-phone, a Sumsung and a Nokia mobiles. How many different ways to cover these mobiles: P(20, 3) O (20, 3) 20+20+20 20*20*20
Question 24
Consider a recursively defined set S such that
4 is an element of S
(x + y) is an element of S if both x and y are elements of S.
S is equal to the
Set of negative multiples of 4
Set of even numbers
Set of positive multiples of 4
Set of multiples of 3
Transcribed Image Text:Question 24 Consider a recursively defined set S such that 4 is an element of S (x + y) is an element of S if both x and y are elements of S. S is equal to the Set of negative multiples of 4 Set of even numbers Set of positive multiples of 4 Set of multiples of 3
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