Find the next term: 2, 6, 12, 20, 30, ...
Answer and explanation
Correct answer: B. 42
- Step 1: Differences between terms: 4, 6, 8, 10.
- Step 2: The differences rise by 2, so the next difference is 12 and 30 + 12 = 42 (the terms are n(n+1)).
Answer
42.
Why not the others: The other rules do not fit the earlier terms: the differences are not constant, not rising by 1, and the ratios are not constant.
Practise more Logical-Mathematical Ability.
Free questions with an explanation for every one, and full timed Examen Admisión UNMSM (Peru) mock tests.
More Logical-Mathematical Ability questions
- What is the next term in the series 3, 7, 15, 31, 63, ...?
- In a class the ratio of boys to girls is 2 : 3. If there are 45 students in total, how many girls are there?
- A shirt costs 500 soles. It is discounted by 20% and then by a further 10% of the reduced price. What is the final price?
- A train 120 m long travels at constant speed and passes a pole in 8 seconds. How long does it need to cross a bridge 180 m long, from the fr…
- Pedro can paint a fence in 12 days and Rosa can paint it in 24 days. Working together at their usual rates, how many days do they need?
- The average of five numbers is 18. When one number is removed, the average of the remaining four is 16. What number was removed?