Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
2.1k views
in Combinatorics and Mathematical Induction by (49.1k points)
closed by

If nC4, nC5, nC6 are in AP the value of n can be .....

(a) 14 

(b) 11 

(c) 9 

(d) 5

1 Answer

+1 vote
by (46.9k points)
selected by
 
Best answer

(a) 14

30 + n2 – 9n + 20 – 12n + 48 = 0 

n2 – 21 n + 98 = 0 

(n – 7) (n – 14) = 0 

n = 7 (or) 14

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

...