Question

If A=set of primes below 20 B=set of multiples of 3 less than 30 then find n(A-B)

Answer 1

Answer:

n(A - B) = 6

Step-by-step explanation:

A = {2, 3, 5, 7, 11, 13, 19}

n(A) = 7

B = {3, 6, 9, 12, 15, 18, 21, 24, 27}

n(B) = 9

A - B = {2, 5, 7, 11, 13, 19}

n(A - B) = 6

hope you get your answer