\[
{ }^{1} P_{1}+2 \cdot{ }^{2} P_{2}+3 \cdot{ }^{3} P_{3}+\ldots . .+n \cdot{ }^{\mathrm{n}} P_...
\[
{ }^{1} P_{1}+2 \cdot{ }^{2} P_{2}+3 \cdot{ }^{3} P_{3}+\ldots . .+n \cdot{ }^{\mathrm{n}} P_{\mathrm{n}}=
\]
(a) \( { }^{\mathrm{n}+1} P_{\mathrm{n}+1} \)
(b) \( { }^{\mathrm{n}+1} P_{\mathrm{n}+1}-1 \)
(c) \( { }^{\mathrm{n}+1} P_{\mathrm{n}+1}-2 \)
(d) \( { }^{\mathrm{n}+1} P_{\mathrm{n}} \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live
Other Videos By PW Solutions
| 2023-07-03 | A bullet is fired with a velocity u making an angle of \( 30^{\circ} \) with the horizontal plan... |
| 2023-07-03 | In the figure shown below, the charge on the left plate of the \( 10 \mu \mathrm{F} \) capacitor... |
| 2023-07-03 | An electron moves along the line \( A B \), which lies in the same plane as a circular loop of c... |
| 2023-07-03 | A particle moves from position \( \vec{r}_{1}=3 \hat{i}+2 \hat{j}-6 \hat{k} \) to position \( \v... |
| 2023-07-03 | Tuo cells having e.m.f. \( 4 \mathrm{~V}, 2 \mathrm{~V} \) and internal resistances \( 1 \Omega ... |
| 2023-07-03 | Twelve wires of equal length and same cross-section are connected in the form of a cube. If the ... |
| 2023-07-03 | A man walks in rain with a velocity of \( 5 \mathrm{kph} \). The rain drops strike at him at an ... |
| 2023-07-03 | A heavy body of mass \( 25 \mathrm{~kg} \) is to be dragged along a horizontal plane \( (\mu=1 /... |
| 2023-07-03 | If \( 2 \cos ^{2}(\pi+x)+3 \sin (\pi+x) \) vanishes then the values of \( x \) lying in the inte... |
| 2023-07-03 | If \( \cos \theta=-\frac{1}{\sqrt{2}} \) and \( \tan \theta=1,[ \) where \( \mathrm{n} \in \math... |
| 2023-07-03 | \[
{ }^{1} P_{1}+2 \cdot{ }^{2} P_{2}+3 \cdot{ }^{3} P_{3}+\ldots . .+n \cdot{ }^{\mathrm{n}} P_... |
| 2023-07-03 | How many ways are there to seat \( n \) married couples \( (n \geq 3) \) around a table such tha... |
| 2023-07-03 | A set contains \( (2 n+1) \) elements. If the number of subsets of this which contain at most \(... |
| 2023-07-03 | The number of word groups by taking at least 1 letters of each words PATH, GROW and SKIN are-
(a... |
| 2023-07-03 | How many ways \( \mathrm{AA}, \mathrm{BB}, \mathrm{CC}, \mathrm{D}, \mathrm{E}, \mathrm{G}, \mat... |
| 2023-07-03 | Number of ways in which \( K \) identical balls can be distributed in \( p \) different boxes if... |
| 2023-07-03 | Number of distinct terms in the expansions of \( (x+y+z \) \( +w)^{50} \) is equal to.
(a) \( { ... |
| 2023-07-03 | Number of Positive Integral solution of the equation \( x+y+z=102 \).
(a) 5050
(b) 4050
(c) 4950... |
| 2023-07-03 | Nine hundred distinct \( \mathrm{N} \)-digit numbers are to be formed by using 6,8 and 9 only. T... |
| 2023-07-03 | Number of numbers greater than a million using the digits \( 2,3,0,3,4,2,5 \) of these how many ... |
| 2023-07-03 | The number of words of 5 letters that can be made with the letters of the word PROPOSITION.
(a) ... |
1