Question

Q.1 A) Attempt any four of the following.
1) Write the following sets using rule method.
{3, 6, 9, 12, 15, 18, 21}​

Answer 1

hi mate your answer is

3085:56776

Answer 2

The rule method for writing the set {3,6,9,12,15,18,21} is :

Given: The set {3, 6, 9, 12, 15, 18, 21}​.

To Find: The rule method of the set {3, 6, 9, 12, 15, 18, 21}​.

The answer to the question can be found easily by implementing the rule method.

• We know in the rule method that the formula written within the pair of brackets is such that it well defines the elements of the given set.

• Here as we can see the elements are the multiples of 3 and they are defined till the 7th multiple of 3.

• Thus, we can express condition 2 (above point 2) in the following way:

          A= { x | x = 3n, x ∈ N ,  n < 8 }

• Hence, The rule method for writing the set {3,6,9,12,15,18,21} is:

           A= { x | x = 3n, x ∈ N ,  n < 8 }