Question

Consider the set A = {x : x ∈ N and sum of digits in x is same as the number of

digits in x.} . Check whether the set A is finite or not?​

Answer 1

digits in x.} . Check whether the set A is finite or not?C={x:x is a two-digit natural number such that the sum of its digits is 8}

The elements of this set are 17,26,35,44,53,62,71 and 80 only.

Therefore, this set can be written in roster form as C=17,26,35,44,53,62,71,80.

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toppr

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