Brain Test Level 401
Question:
The lock needs a 3-digit code. The sum of the digits must be 18, and they must be strictly increasing.
Solution:
We need to find three unique single digits (A, B, C) such that A + B + C = 18 and A < B < C.
If we start with 1, 2, 3... the sum is too low. If we start near the middle, the required digits are 5, 6, and 7 (5 + 6 + 7 = 18).
Input 567 to unlock.
DIFFICULTY
Medium
PRO TIP
What three unique single-digit numbers add up to 18?