Question

Write the following sets in the roster form
A = {x: x is an alphabet in the word BETTER}
B = {x: x is a prime number which is a divisor of 30}

Answer 1

Answer:

A=(B ,E ,T,T ,E ,R)

B =(T ,E)

Answer 2

Answer:

A={B,E,T,R}

B={2,3,5}

Step-by-step explanation:

for the set A, the letters in the word BETTER are B,E,T,R

the second E and T are not included as they are repeated in the word

therefore A consists of these four letters and hence forms the set

A={B,E,T,R}

for the set B, the factors of 30 are 1,2,3,5,6,10,15,30.

so the prime numbers among them are 2,3,5

hence the set B consists of 2,3,5 resulting in

B={2,3,5}