Home › CAT › Quantitative Aptitude › Permutations and Combinations › Using 5 different flags, signals of at least 2 f…
Using 5 different flags, signals of at least 2 flags on a staff number:
A420
B320
C120
D220
Answer & Solution
Correct answer: B. 320
1. Two flag signals give 20 and three give 60.
2. Four give 120 and five give 120.
3. The total is 320.
_Source: NCERT Class 11 Mathematics, Chapter 7, Permutations and Combinations._
Related questions
Signals using exactly 4 flags out of those 5 different flags number:Signals using exactly 3 flags out of 5 different flags number:Three digit even numbers from the digits 1 to 6, with repetition allowed, number:The number of ways to arrange all 5 different flags on a staff is:The relation linking arrangements and selections of r objects from n is nPr equals:Permutations of n objects where p are alike and the rest all differ number:The number of permutations of n different objects taken r at a time, with no repetition, iThe value of 6 factorial is: