MAH MCA CET 2024
In the series given below, a wrong number is given. Find out the number: 1, 2, 3, 5, 12, 15, 48, 53, 212, 217, 1090
Answer (Detailed Solution Below)View answer ▾Hide ▴
Answer: Option C — 53
Detailed Solution
The terms follow the operations , , , , , , , , , : .
After 48 the next term should be , but 53 is given. The terms that follow confirm 52: .
✓ Check
The tail also fits the pattern: and .⚠ Common trap
Option (D), 212, may look wrong because , but 212 is ; it follows from the correct earlier term, so the fault is 53.Quick tip
Pattern:
💬 Discussions on this question
Ask a doubt ›Still stuck on this question? Ask our faculty and fellow students — answers appear here.
Ask a doubtMore Series Questions
View all ›More Logical Reasoning Questions
- Q1.Six persons A, B, C, D, E, and F are sitting in a row facing north. B sits third to the left of F. A sits to the immediate right of B. D sits second to the right of F. E sits to the immediate right of A. Who sits at the extreme right end?Linear Arrangement
- Q2.Five friends P, Q, R, S, and T are standing in a row. P is to the left of Q but to the right of T. R is to the right of Q. S is between Q and R. Who is standing in the middle?Linear Arrangement
- Q3.Eight people 1 through 8 sit in a row. 3 sits exactly midway between 1 and 5. 5 sits to the immediate left of 7. 2 sits third to the right of 8. 6 sits to the immediate right of 2. 4 sits between 6 and 7. Who sits second from the left?Linear Arrangement
- Q4.A, B, C, D, and E are five houses in a row from left to right. C is to the right of B and to the left of E. A is to the left of B. D is to the right of E. Which house is in the middle?Linear Arrangement
- Q5.Seven students sit in a row. Priya is second from the right. Raj is third to the left of Priya. Meena is immediately to the right of Raj. Sam is between Meena and Priya. Two students sit to the left of Raj. Who sits at the extreme left?Linear Arrangement
Series — Preparation
This question tests your understanding of Series, a key topic in the Logical Reasoning section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Series questions give a sequence of numbers, letters or a mix of both, and ask you to find the next term, a missing term, or the wrong term. This topic covers number series (based on differences, squares and cubes, multiplication, or mixed operations), letter series, alphanumeric series, and repeating letter patterns. Start by checking the differences between consecutive terms. If those don't show a pattern, check the second differences, ratios, squares and cubes nearby, or whether two separate series alternate. For letter series, convert letters to their alphabet positions and look for the number pattern. With practice, recognising common patterns becomes quick and these questions become reliable marks. Practise the series questions below, each with a step-by-step solution that shows the pattern.