Sum of Two-Digit Numbers
Probability
Level
2
What is the sum of all 2-digit positive integers whose digits are either 1, 2, 3 or 4?
Details and assumptions
The number 01 is a 1-digit number.
The digits do not need to be distinct.
We are only interested in the positive integers whose digits belong to 1, 2, 3, 4.
by
Arron Kau