Question

A={x:x£N and sum of digits of X is same as the number of digits of X } finite or infinite give reason step by step​

Answer 1

Answer:

A = { 20, 120, 300....................}

Step-by-step explanation:

sure sure for X to be an element of set A the condition is that the number of digits in that number should be equal to the sum of the digits. then only x will be an element of set A. for example let's take the number 20. it has two digits and the sum of the digits that is 2 + 0 is equal to 2. so here the number of digits is equal to the sum of digits present in that number. hence XX can be considered as an element of set A. other than these we can also take 120 300 etc. we don't know actually how many such numbers are there till infinity and we cannot actually Kaun those numbers so we can say that it is an infinite set

hope it helps you

Answer 2

Answer:

Represent A

4

= (x : x is a two digit number and sum of the digits of x is 7) in roster form

Answer

Two digit numbers who sum of digits is 7 are 16,25,34,43,52,61,70

So, the set as A4 = { 16,25,34,43,52,61,70}

Step-by-step explanation:

yah sirf explain ke liye hai