Question

In the following questions below, one term in the given number series is wrong. Find out the wrong term
11, 5, 20, 12, 40, 26, 74, 54

• A. 5
• B. 20
• C. 40
• D. 26

Answer 1

The Correct Option is C

The problem requires us to identify the incorrect term in the sequence: 11, 5, 20, 12, 40, 26, 74, 54. Let’s analyze the pattern:
Observe pairs of the series:
1. 11 and 5
2. 20 and 12
3. 40 and 26
4. 74 and 54
The series builds from alternating addition and subtraction:

• Step 1: From 11 to 5, subtract 6.
• Step 2: From 5 to 20, add 15.
• Step 3: From 20 to 12, subtract 8.
• Step 4: From 12 to 40, add 28.
• Step 5: From 40 to 26, subtract 14.
• Step 6: From 26 to 74, add 48.
• Step 7: From 74 to 54, subtract 20.

Upon analyzing, there is a sequence pattern:

n	Operation	Difference
1	subtract	6
2	add	15
3	subtract	8
4	add	16
5	subtract	8
6	add	24
7	subtract	12

The difference doesn't steadily increase. Specifically, from 12 to 40, the expected addition should be 16, not 28. Therefore, 40 is incorrect. Correcting this by adding 16 results in 28.