Related InterviewSolutions

• How many different selections of 4 books can be made from 10 different books, if(i) there is no restriction?(ii) two particular books are always selected?(iii) two particular books are never selected?
• A boy has 3 library tickets and 8 books of his interest in the library.Of these 8, he does not want to borrow Chemistry part II, unless ChemistryPart I is also borrowed. In how many ways can be choose thethree books to be borrowed?
• \(\displaystyle\sum_{r=1}^{m}\)n+rCr Write ∑n+rCr r∈(0,m) in the simplified form.
• A businessman hosts a dinner to 21 guests. He has 2 round tables which can accommodate 15 and 6 persons each. In how many ways can he arrange the guests?
• If nC4 = nC6, find 12Cn.
• If nC12 = nC5, find the value of n.
• If nC12 = nC8, then n = A. 20 B. 12 C. 6 D. 30
• If nCr+1 = nC8 then find the value of 22Cn.
• If 15C3r = 15Cr + 3, find r.
• Three persons enter a railway compartment. If there are 5 seats vacant, in how many ways can they take these seats? A. 60 B. 20 C. 15 D. 125