Question

- Given that B = {3, 6, 9, 12, 15, ..., 30}, find the value of n(B).​

Answer 1

Answer :

n(B)=10

Step-by-step explanation:

n(B) means number od element inside set B.

Elments are the no.s , alphabets or variables inside a set.

Given:B = {3,6,9,12,15......,30}

As we can see the elements inside the set represent the table of three(3)i.e they are divisible by 3.

So, the no.s should be divisible by 3 but less than 30.

Therefore, the no.s are:3,6,9,12,15,18,21,24,27,30

Hence, the elements inside set B will be : B = {3,6,9,12,15,18,21,24,27,30}Since the no. of elements in set be is 10

So, the answer will be 10 that is, n(B)=10.