Rows follow a pattern: 2, 4, 8 / 3, 9, 27 / 4, ?, 64. What is the missing number?
Answer and explanation
Correct answer: B. 16
- Step 1: Row 1: 2, 2^2 = 4 and 2^3 = 8; row 2: 3, 9 and 27. Step 2. Row 3 starts at 4, so the middle number is 4^2 = 16 (and 4^3 = 64 checks). Answer: 16. Why not the others: The last number 64 = 4^3 requires the middle value 4^2.
Practise more Logical Reasoning.
Free questions with an explanation for every one, and full timed Prueba Unica Nacional (Peru Teacher Appointment Test) mock tests.
More Logical Reasoning questions
- What number comes next in the series 5, 9, 13, 17, ... ?
- What number comes next in the series 2, 6, 18, 54, ... ?
- In the series 1, 1, 2, 3, 5, 8, ... each term follows a rule. Which term comes next?
- What number comes next in the series 1, 4, 9, 16, 25, ... ?
- What letter comes next in the series A, C, F, J, O, ... ?
- Rule: 'If it rains, the school yard is closed.' The yard is open today. Which conclusion is certain?