2024 · Q24
What is the sum of the largest and the smallest 4-digit numbers made by using single digit prime numbers (without repetition)?
Elementary MathematicsNumber System
- A7887
- B7997
- C8998
- D9889
Explanation
Single-digit primes are 2, 3, 5, 7. The largest 4-digit number without repetition is 7532 and the smallest is 2357. Their sum is 7532 + 2357 = 9889 — option D.