PI - Cognitive Assessment Number Series Problems Questions and Answers

Question 1

Which number logically follows in this sequence? 4, 6, 10, 18, 34, ?

Accepted Answer

66

Answer

The pattern is to multiply the difference between the previous two numbers by 2 and add it to the last number. The differences are 2, 4, 8, 16. The next difference will be 16 * 2 = 32. So, the next number is 34 + 32 = 66.

Question 2

A data analyst is tracking the daily number of system errors. The sequence for the past week was 88, 86, 91, 89, 94, 92, ?. If the pattern continues, what is the expected number of errors for the next day?

Accepted Answer

97

Answer

This is an alternating series with two interleaved patterns. The first pattern (88, 91, 94) increases by 3 each time. The second pattern (86, 89, 92) also increases by 3. The next number belongs to the first pattern, so it will be 94 + 3 = 97.

Question 3

Identify the missing number in the following series: 3, 9, 27, ?, 243, 729

Accepted Answer

81

Answer

This is a geometric sequence where each number is multiplied by 3 to get the next number. 3 * 3 = 9, 9 * 3 = 27, so the missing number is 27 * 3 = 81. To verify, 81 * 3 = 243, and 243 * 3 = 729.

Question 4

Which of the following number series follows the rule 'n, n*2-2'?

Accepted Answer

6, 10, 18, 34

Answer

For the series 6, 10, 18, 34: The second number is 6*2-2=10. The third number is 10*2-2=18. The fourth number is 18*2-2=34. This series correctly follows the specified rule.

Question 5

What is the next number in the sequence: 1, 1, 2, 3, 5, 8, 13, ?

Accepted Answer

21

Answer

This is the Fibonacci sequence, where each number is the sum of the two preceding ones. The next number is 8 + 13 = 21.

PI - Cognitive Assessment Practice Test

PI - Cognitive Assessment Practice Test

PI - Cognitive Assessment Number Series Problems Questions and Answers