Advertisements
Advertisements
Question
Choose the correct alternative:
If Pr stands for rPr then the sum of the series 1 + P1 + 2P2 + 3P3 + · · · + nPn is
Options
Pn + 1
Pn + 1 – 1
Pn + 1 + 1
`""^(("n" + 1))"P"_(("n" - 1))`
Solution
Pn + 1
APPEARS IN
RELATED QUESTIONS
How many 4-digit numbers are there with no digit repeated?
Find x in each of the following:
Which of the following are true:
(2 × 3)! = 2! × 3!
If three six faced die each marked with numbers 1 to 6 on six faces, are thrown find the total number of possible outcomes ?
Find the number of ways in which one can post 5 letters in 7 letter boxes ?
Evaluate each of the following:
P(6, 4)
Write the number of ways in which 6 men and 5 women can dine at a round table if no two women sit together ?
The number of arrangements of the word "DELHI" in which E precedes I is
Find x if `1/(6!) + 1/(7!) = x/(8!)`
Find the number of arrangements that can be made out of the letters of the word “ASSASSINATION”.
How many strings can be formed from the letters of the word ARTICLE, so that vowels occupy the even places?
How many ways can the product a2 b3 c4 be expressed without exponents?
A coin is tossed 8 times, how many different sequences containing six heads and two tails are possible?
How many strings are there using the letters of the word INTERMEDIATE, if all the vowels are together
How many strings are there using the letters of the word INTERMEDIATE, if vowels are never together
If the letters of the word FUNNY are permuted in all possible ways and the strings thus formed are arranged in the dictionary order, find the rank of the word FUNNY
The number of arrangements of the letters of the word BANANA in which two N's do not appear adjacently is ______.
In how many ways can 5 children be arranged in a line such that two particular children of them are always together
If m+nP2 = 90 and m–nP2 = 30, then (m, n) is given by ______.
