Math, asked by kayakrissane4526, 1 year ago

If 6Pr = 360 and If 6Cr = 15, find r ?
A.5
B.6
C.4
D.3

Answers

Answered by nina46

3

6pr=360, 6Cr=15

6Cr= 6Pr/r!
r!=6Pr/6Cr
r!=360/15
r!=24
r=4 (since 4!=24)
ans =C

Previous Question

Next Question

Similar questions

Math, 7 months ago

a class has 30 students 2 /3 are boys how many are girls?

Math, 7 months ago

which number will we reach if we move 8 steps to the right of (-18) +9 on a number line...

Science, 7 months ago

plzzzz answer these questions...

Math, 1 year ago

A question paper consists of three sections 4,5 and 6 questions respectively. Attempting one question from each section is compulsory but a candidate need not attempt all the questions. In how many ways can a candidate attempt the questions? A.209 B.(4!-1)*(5!-1)*(6!-1) C.119 D.29295...

Math, 1 year ago

To gain 10% on selling sample of milk at the cost price of pure milk, the quantity of water to be mixed with 50 kg. of pure milk is: A.2.5 kg B.5 kg C.7.5 kg D.10 kg...

English, 1 year ago

He pleaded that he was ignorant of the law.( Use: ignorance)...

Science, 1 year ago

what will happen to a cell if its nuclrous is not present...

Economy, 1 year ago

mention 2 steps taken by government for skiĺ development...