An ordered pair (m, n) of non-negative integers is called “simple” if the addition m+n in base 10 requires no carrying. Find the number of simple ordered pairs of non-negative integers that sum to 1492 .
An ordered pair (m, n) of non-negative integers is called “simple” if the addition m+n in base 10 requires no carrying. Find the number of simple ordered pairs of non-negative integers that sum to 1492 .