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3 years ago

14

I need answer quickly

1 answer:

DerKrebs [107]3 years ago

4 0

Answer: a is the # of elements in A but NOT B, that is A ONLY

b is the # of elements in B but NOT A, that is B only

N is the # of elements in the INTERSECTION of A and B

a + N = 99

b + N = 25

a + b + N = 123

Subtracting the first two equations: a - b = 74

Subtracting the last two equations: -a = -98

a = 98

So then a - b = 74 and a = 98

98 - b = 74

-b = -24

b = 24

a = 98, b = 24 and a + b + N = 123

98 + 24 + N = 123

122 + N = 123

N = 1

98 are in A only

24 are in B only , which is the answer to the question

1 is in both A and B

Step-by-step explanation:

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