Look at the number sequence: 3, 6, 9, 12, ___. What is the missing number?
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Worked Solution
Step 1: Find the rule by checking the difference between consecutive numbers.
6 - 3 = 3, 9 - 6 = 3, 12 - 9 = 3.
The rule is: add 3 each time.
Step 2: Apply the rule to find the missing number.
12 + 3 = 15.
Answer: The missing number is 15.
Correct answer: 15
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