Advertisements
Advertisements
प्रश्न
Evaluate `("n"!)/("r"!("n" - "r")!)` when n = 5 and r = 2.
Advertisements
उत्तर
`("n"!)/("r"!("n" - "r")!) = (5!)/(2!(5 - 2)!) = (5!)/(2! xx 3!) = (5 xx 4 xx 3 xx 2 xx 1)/(2 xx 1 xx 3 xx 2 xx 1)` = 10
APPEARS IN
संबंधित प्रश्न
In how many of the distinct permutations of the letters in MISSISSIPPI do the four I’s not come together?
Find the total number of ways in which 20 balls can be put into 5 boxes so that first box contains just one ball ?
The number of words that can be formed out of the letters of the word "ARTICLE" so that vowels occupy even places is
Find the rank of the word ‘CHAT’ in the dictionary.
A student appears in an objective test which contain 5 multiple choice questions. Each question has four choices out of which one correct answer.
How will the answer change if each question may have more than one correct answers?
Find the number of strings that can be made using all letters of the word THING. If these words are written as in a dictionary, what will be the 85th string?
Find the sum of all 4-digit numbers that can be formed using digits 0, 2, 5, 7, 8 without repetition?
The number of arrangements of the letters of the word BANANA in which two N's do not appear adjacently is ______.
In a certain city, all telephone numbers have six digits, the first two digits always being 41 or 42 or 46 or 62 or 64. How many telephone numbers have all six digits distinct?
The total number of 9 digit numbers which have all different digits is ______.
