Please Answer the following questions, Discrete mathematics Question 25Assume 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+2020*20*20 Question 24Consider a recursively defined set S such that4 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 theSet of negative multiples of 4Set of even numbersSet of positive multiples of 4Set of multiples of 3

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Description: Please Answer the following questions, Discrete mathematics Question 25Assume 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+2020*20*20

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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