Question

b. K ={ x: x ∈ N, x is a multiple of 5 and < 400}

Answer 1

Answer:

K={5,10,15,20,25,30,35,40,----100,105,110,-------------,385,390,395}

Answer 2

Step-by-step explanation:

so K is a set of all those numbers which are multiple of 5 from 5 to 395.

The question is not clear, but if you are asking the size of set, it is 395/5 = 79