- A72
- B36
- C81
- D18
Step-by-Step Solution
The posts are different, so order matters: . (36 treats the two posts as the same.)
Answer: A) 72
A housing society of 9 members elects a president and a secretary (different people). How many outcomes are possible?
Competition practicePermutations & Combinations
Master this topic in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Permutations & Combinations practice questions
More Permutations & Combinations practice
Seven runners race and there are no ties. In how many ways can the gold, silver and…How many words, with or without meaning, can be formed using all the letters of INDIA?Digits may repeat. How many 4-digit numbers have every digit odd?Six different chocolates are to be given to two children, Aman and Babli. A child may…Without repeating a digit, how many 3-digit numbers can be formed from 0, 1, 2, 3 and 4?