Question

A= {3, 6, 9, 12, 15) then write n(A)=?​

Answer 1

Step-by-step explanation:

In the sequence: 3, 6, 9, 12, 15, ……divide each number by three to get

1, 2, 3, 4, 5, ….. So the next number is 6 and 6 multiplied by 3 is 18. Hence the next number in the original sequence is 18, followed by 21, 24, 27, etc.

Answer 2

Answer:

n(A) is equal to 5

n(A) means cardinal no of A (i.e) no of elements in the given set