a)In how many ways can 4 people sit in a row of 6 chairs
b)In how many ways can 3 people sit in a row of 7 chairs
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A) nPr = n! / (n-r) !
6P4 = 6! / (6-4)!
= 6*5*4*3*2*1 / 2*1
=6*5*4*3 = 360
B) nPr = n! / (n-r) !
7P3 = 7! /(7-3)!
=7*6*5*4! / 4!
=7*6*5 = 210
6P4 = 6! / (6-4)!
= 6*5*4*3*2*1 / 2*1
=6*5*4*3 = 360
B) nPr = n! / (n-r) !
7P3 = 7! /(7-3)!
=7*6*5*4! / 4!
=7*6*5 = 210
mrambabu1600:
its 6 p 4 not 6 c 4
If you know, why are you asking?
I dont know exactly whether it is correct ot not
In answer they gave 6 p 4
yeah...it is 6p4 only...
ok
ok bro
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