Tagged with 172

#math trivia #172 solution

#math trivia for #June20: #172 has three digits that add to 10. How many numbers 100-999 do? — Burt Kaliski Jr. (@modulomathy) June 21, 2012 This is one of those problems that gets easier by recursion.  In particular, for each of the possible first digits, a, of the three-digit number, we just need to know … Continue reading