Question

How many ten-digits numbers (written in base
ten) have this property : For 1≤k≤10, the kth
digit from the left is equal to the number of
times the digit k-1 appears in the number.
(1) 0 (2) 1 (3) 2 (4) 3​

Answer 1

Answer:

3 I think because k-1 comes as 2-1 =1