Question

Write the following set in listing method F = { x|x∈ 5n, n∈ N,n<_4​

Answer 1

Step-by-step explanation:

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

$\huge\fbox\pink{✯Answer✯}$

Here X = 5n,

And where n is natural number and n<_4

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

So, in roster form

A={5,10,15,20}

• Cardinal number = no. of distinct elements in the Set =4

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