Which number continues the sequence? 1, 3, 6, 10, 15, 21, ...
Answer and explanation
Correct answer: D. 28
- Step 1: The differences grow by one each time. Step 2. 21 + 7 = 28. Answer: 28. Why not the others: 27: the step did not grow. 29: the step grew too much. 42: the last number was doubled.
Practise more Number and Letter Sequences.
Free questions with an explanation for every one, and full timed Ausbildung Aptitude Test (Einstellungstest) mock tests.