Business Mathematics and Basic Statistics · Class 12 Commerce
Ch 9Logical Reasoning — Class 12 Business Mathematics and Basic Statistics, concept-first.
This chapter covers the Logical Reasoning unit of the WBCHSE Class 12 Business Mathematics and Basic Statistics syllabus; the same number-series, coding-decoding, direction-sense, seating-arrangement and blood-relation puzzle types taught here are also the standard reasoning-ability questions asked in most national ban…
Key concepts
Hover a concept to preview it and jump to its most relevant Q&A.
Number Series, Coding-Decoding and Odd Man Out
A number series follows a single hidden rule (a constant difference, a constant ratio, or a changing pattern in the differences) that must be identified before finding a missing or next term.
Most relevant Q&A
- Find the missing number in the series: 3, 6, 11, 18, 27, ? (a) 36 (b) 38 (c) 40 (d) 42Free
- In a certain code, CHAIR is written as DIBJS. How will TABLE be written in that code? (a) UBCMF (b) UACLF (c) SZAKD (d) UBDMFFree
- Find the odd one out: (a) 5 (b) 7 (c) 9 (d) 11Preview
- Find the next number in the series: 2, 4, 8, 16, 32, ?Free
- In a certain code, MADRAS is written as NBESBT. How will BOMBAY be written in that code?Free
In previous exams
How often this chapter’s concepts have been examined — real appearance data, never estimated.
Chapter contents
The NCERT structure, section by section. Open a section to see its questions, then read the concept-first solution.
Number Series, Coding-Decoding and the Odd Man Out
This chapter covers the Logical Reasoning unit of the WBCHSE Class 12 Business Mathematics and Basic Statistics syllabus; the same number-series, coding-decoding, direction-sense, seating-arrangement…
Direction Tests
A direction test problem describes a person (or an object) moving in a straight line, then turning through a right angle or more, and asks either how far the person now is from the starting point, or…
Seating Arrangements
A seating arrangement problem gives a set of clues about where several people sit — relative to a row's ends, relative to each other ("immediately to the left of," "second from the right," "between tw…
Blood Relations
A blood relations problem describes a chain of family relationships in words — often stated from one person's own point of view ("my father's only son," "the daughter of my mother's brother") — and as…
More questions
15 Q+−Show 6 questionsHide questions6 questions
- Example 1Find the missing number in the series: 3, 6, 11, 18, 27, ? (a) 36 (b) 38 (c) 40 (d) 42Free
- Example 2In a certain code, CHAIR is written as DIBJS. How will TABLE be written in that code? (a) UBCMF (b) UACLF (c) SZAKD (d) UBDMFFree
- Example 3Find the odd one out: (a) 5 (b) 7 (c) 9 (d) 11Preview
- Example 7Rahul starts walking facing East. He walks 5 km, then turns right and walks 3 km, then turns right again and walks 5 km. How far is he now f…Preview
- Example 10Five friends P, Q, R, S and T are sitting in a row. Q is sitting third from the left. P sits immediately to the left of Q, and R sits immedi…Preview
- Example 13Pointing to a photograph, Rita said, 'He is the son of my grandfather's only son.' How is the man in the photograph related to Rita?Preview
+−Show 9 questionsHide questions9 questions
- Q4Find the next number in the series: 2, 4, 8, 16, 32, ?Free
- Q5In a certain code, MADRAS is written as NBESBT. How will BOMBAY be written in that code?Free
- Q6Find the odd one out: (a) 16 (b) 36 (c) 49 (d) 60Free
- Q8A man walks 4 km towards North, then turns left and walks 4 km, then turns left again and walks 4 km. How far and in which direction is he f…Preview
- Q9Point B is 6 km to the East of Point A. Point C is 8 km to the North of Point B. What is the shortest distance between A and C? (a) 10 km (b…Preview
- Q11Six people A, B, C, D, E and F are sitting in a row facing the same direction. B is second from the left end. D is third from the right end.…Preview
- Q12Four people P, Q, R and S are sitting around a circular table, all facing the centre. Q is sitting to the immediate right of P. R is sitting…Preview
- Q14A is the brother of B. C is the mother of A. D is the brother of E. E is the daughter of B. How is D related to C? (a) Son (b) Grandson (c)…Preview
- Q15Introducing a man, a woman said, 'His mother is the only daughter of my mother.' How is the woman related to the man?Preview