Question

set A = { x such that x element N and sum of digits in x is same as number of digit of x }

( i ) Check whether set A is finite or not ?​

Answer 1

Answer:

Find a number x such that sum of x and its digits is equal to given n.

Given a positive number n. We need to find a number x such that sum of digits of x to itself is equal to n.

If no such x is possible print -1.

Examples:

Input : n = 21

Output : x = 15

Explanation : x + its digit sum = 15 + 1 + 5 = 21

Input : n = 5

Output : -1