Math, asked by ronitsriv, 9 months ago

Some please explain me this step. Permutations and Combinations class 11 NCERT.

Attachments:

Answers

Answered by konrad509

1

Both sides were multiplied by $(6-r)(5-r)(4-r)$ to get rid of fractions. $5!$ and $(4-r)!$ got cancelled out. And so remained $(6-r)(5-r)=6$

Previous Question

Next Question

Similar questions

Math, 5 months ago

chris is walking at a speed of 3.25 miles per hour. if he continues to walk at the same speed. how far can chris walk in 1.5 hours?

Science, 5 months ago

If one side of a cube is 6 cm long and it weights 220 grams, what is the density??

Chemistry, 5 months ago

Tell first wala only pls ?

Geography, 9 months ago

why Antarctica called biggest desert...

English, 9 months ago

who can help me by class 9 question paper or format ..Which type of question is coming in annual exam 2019 SABÀ.plz help..

Physics, 1 year ago

find the nature ,position and magnification of the images formed by a convex lens of focal length 0.20m if the object is placed at a distance of (1) 0.50m (2) 0.25m (3) 0.15m...

Math, 1 year ago

A,B and C are three points on a circle with centre O such that angle BOC =30°and abgle AOB=50°. if D is a point on the circle other than the arc, find angle ADC.

Math, 1 year ago

what is the probability of 0?