AT&T Information Practice Test

What is the next number in the sequence 3, 6, 9, 12, ?

18 21 15 12

Correct Answer:

Explanation:

This is an arithmetic sequence where each term increases by a constant amount. The difference between consecutive terms is 3 (6−3=3, 9−6=3, 12−9=3). To continue the pattern, add 3 to the last term: 12+3=15. So the next number is 15. Choices like 18 or 21 would skip steps, and 12 would not advance the sequence.

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