Select Page

questions on permutation or combination set 04

(Q). In how many ways batting order of 11 players can be made out of 15 players if Rohit is always selected ? Sol:- Since Rohit is always selected so we are to select 10 players out of remaining 14 players which can be done in ¹⁴C₁₀ ways. Now these 11 players can be...

questions on permutation or arrangement set 03

(Q). In how many ways 5 distinct volumes of chemistry & 7 distinct volume of botany books can be arranged on a bookshelf such that no two botany books are together ?Sol:-   •C₁•C₂•C₃•C₄•C₅•From above figure we have 6 places (marked by •) to place 7 botany books.So...

questions on permutation or arrangement set 02

(Q). In how many ways batting order of 11 players can be made out of 15 players ? Sol:- First select then arrange. 11 Players can be  selected out of 15 players in ¹⁵C₁₁ ways. Now these 11 players can be arranged in 11! ways. Hence total number of ways = ¹⁵C₁₁.11!   ...

questions on permutation or arrangement set 01

(Q).  In how many ways 15 students can be arranged in a row ?Sol:- 15 students can be arranged in a row in 15! ways       Answer (Q). In how many ways 8 prizes from 1ˢᵗ to 8ᵗʰ can be given to a group of 8 students that includes 4 boys & 4 girls. Here a student can...