Puzzles
Subsum
1) In a set of three integers, will there always be two integers whose sum is even?
2) How many integers must there be in a set so that there will always be three integers in the set whose sum is a multiple of 3?
3) How many integers must there be in a set so that there will always be four integers in the set whose sum is even?
4) How many integers must there be in a set so that there will always be three integers in the set whose sum is even?
If you enjoyed this puzzle, check out Sunday Afternoon Maths LII,
puzzles about sums, or a random puzzle.
puzzles about sums, or a random puzzle.