Question

Write the sets in roster form and description form: (i) {x:x=n^2, n € N and n < 8}

Answer 1

Answer:

ANSWER

x=3n

where n is a natural number and n<8

So, n can be any digit from 1,2,3,4,5,6,7

So, in roster form

A={3,6,9,12,15,18,21}

Cardinal number = no. of distinct elements in the Set=7

Answer 2

Answer:

answer for the given problem is given