Question

In a four-digit number non-zero and distinct digits, the sum of digit at the unit position and the tens position is equal to the sum of the remaining two digits. The sum of the digits at the tens and the hundreds positions is three times the sum of the remaining two digits. If the sum of the digit is not more than 20, then how many such four digit numbers are possible?

Answer 1

The Commutative Property Lesson and Quiz