Solved IB ACIO Question
A solved IB ACIO PYQ - decoded step-by-step.
Solve it the standard way once - then learn the shortcut.
Q · Missing Numbermedium · 45s
What number replaces the question mark?2, 6, 12, 20, 30, ?
TopicMissing Number
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.25
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
Numbers represent n(n+1); for n=6: 6×7=42 (Option correction: Correct answer is 42).
Final Answer: Option B - 40