सिद्ध कीजिए कि- \[ r \cdot{ }^{n} C_{r}=(n-r+1) \cdot{ }^{n} C_{r-1} \]

Channel:
PW Solutions
Subscribers:
449,000
Published on ● Video Link: https://www.youtube.com/watch?v=tTyAxZDpa6o


Duration: 2:35
1 views
0

सिद्ध कीजिए कि-
\[
r \cdot{ }^{n} C_{r}=(n-r+1) \cdot{ }^{n} C_{r-1}
\]
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2022-12-01A line of charge extends along a \( \mathrm{X} \)-axis whose linear charge density varies direct...
2022-12-01The fig. shows the distribution of three charges \( -Q,+Q \) and \( -Q \) on the \( X \)-axis. W...
2022-12-01A nonconducting ring of radius \( R \) has uniformly distributed positive charge \( Q \). A smal...
2022-12-01The maximum electric field at a point on the axis a uniformly charged ring is \( \mathrm{E}_{0} ...
2022-12-01If an object made of substance A rubs an object made of substance B, then A becomes positively c...
2022-12-01Calculate heat of formation of \( \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(l) \) at constant vo...
2022-12-01The variation of electric field between the two charges \( q_{1} \) and \( q_{2} \) along the li...
2022-12-01Four metallic plates are placed as shown in the figure. Plate 2 is given a charge \( \mathrm{Q} ...
2022-12-01If a body is charged by rubbing it with another body then its weight :- (A) may increase slightl...
2022-12-01Which of the following reactions depict the nucleophilic substitution of \( \mathrm{C}_{2} \math...
2022-12-01सिद्ध कीजिए कि- \[ r \cdot{ }^{n} C_{r}=(n-r+1) \cdot{ }^{n} C_{r-1} \]
2022-12-01If \( f_{n}(x)=e^{f_{n-1}(x)} \) for all \( n \in N \) and \( f_{0}(x)=x \), then \( \frac{d}{d ...
2022-12-01Which of the following statement is not correct : \( \mathrm{P} \) (A) \( \mathrm{Fe}, \mathrm{N...
2022-12-01Read the statements carefully \( \mathrm{P} \) (A) Wheat variety, Atlas 66 having a high protein...
2022-12-01Packing fraction of FCC and HCP units cells are same. \( \mathrm{P} \) W
2022-12-01Isobutyl magnesium bromide with dry ether and absolute alcohol gives (A) and \( \mathrm{CH}_{3} ...
2022-12-01\( \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \stackrel{\mathrm{Fe}+\mathrm{Mo}}{...
2022-12-01अग्रालिखित आवर्त दशमलवों के मान परिमेय संख्या के रूप में व्यक्त कीजिए- \( 1.7 \dot{2} \dot{3} \)
2022-12-01Bayers reagent used to detect olifinic double bond is : \( \mathrm{P} \) (A) Acidified \( \mathr...
2022-12-01To which of the following series the transition element from \( Z=39 \) to \( Z=48 \) belong : (...
2022-12-01The equation of transverse wave in stretched string is \[ y=5 \sin 2 \pi\left[\frac{t}{0.04}-\fr...