IKMC 2027 - Grades 5-6 - Self-study SET 12 - Thematic Batch 3 Question 11

Peter has three cards bearing 2, 4, 8. He uses them to form every possible positive integer, using any nonempty selection without reusing a card. How many different integers can he obtain?



A nonempty selection of the cards may be used; no card is reused.