Advertisements
Advertisements
प्रश्न
For all n > 0, nC1 + nC2 + nC3 + …… + nCn is equal to:
विकल्प
2n
2n – 1
n2
n2 – 1
Advertisements
उत्तर
2n – 1
APPEARS IN
संबंधित प्रश्न
Evaluate 4! – 3!
Find r if `""^5P_r = 2^6 P_(r-1)`
A customer forgets a four-digits code for an Automatic Teller Machine (ATM) in a bank. However, he remembers that this code consists of digits 3, 5, 6 and 9. Find the largest possible number of trials necessary to obtain the correct code.
Find the total number of ways in which 20 balls can be put into 5 boxes so that first box contains just one ball ?
Write the number of ways in which 5 boys and 3 girls can be seated in a row so that each girl is between 2 boys ?
Evaluate `("n"!)/("r"!("n" - "r")!)` when n = 5 and r = 2.
If `""^(("n" – 1))"P"_3 : ""^"n""P"_4` = 1 : 10 find n
In how many ways can the letters of the word SUCCESS be arranged so that all Ss are together?
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 number of permutations of n distinct things taken r together, in which 3 particular things must occur together.
