Question

(0) Take U= (1,2,3,4,5,6,7,8,9,10) A = (All prime number less than 10) and B = ( All odd natural numbers less than 10)
find:
(i) AUB
lii) B-A​

Answer 1

Explanation:

U=(1,2,3,4,5,6,7,8,9,10)

A=(1,2,3,5,7)

B=(1,3,5,7,9)

(I)AUB=(1,3,5,7)

(ii)B-A=9

Answer 2

i)AUB = {2,3,5,7,} U {1,3,5,7,9}

={1,2,3,5,7,9}

ii)B-A ={1,3,5,7,9} - {2,3,5,7}

={1,9}

NOTE:-

prime number is a positive integer that has exactly two positive divisors. However, 1 only has one positive divisor (1 itself), so it is not prime.