Question

write the number of the following set. A=(2,6,9,12,15,18,21)​

Answer 1

Answer:

n(A) = 7

Step-by-step explanation:

the number of elements in a set we represent as

n(A) .....

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Answer 2

Answer:

1,2,3,4,5,6,7,

Step-by-step explanation:

It's very easy like multiplication table of 3

so, this the right answer