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there are 4 boxes colored red,yellow,green and blue.if 2 boxes are selected , how many combination are there for atleast one green box or one red box to be selected?
a)1 b)6 c)9 d)5
Read Solution (Total 5)
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- __ __ (two boxes)in one box R or G is to be placed so,2C1 and in remaining one box can be filled in 3C1 ways so ,total is =====2C1+3C1=5
- 12 years agoHelpfull: Yes(21) No(2)
- no of combinations with one green and no red=2
no of combinations with one red and no green=2
no of combinations with both red and green=1
total no of combinations=2+2+1=5 - 12 years agoHelpfull: Yes(6) No(1)
- 4 boxes .and selecting 2...so its 4C2..AND ONLY 1 COMBINATION "BLUE AND YELLOE" IS EXCEPTIONAL.SO..(4C2)-1=5
- 12 years agoHelpfull: Yes(5) No(0)
- ans is 5
ry
rg
rb
gb
gy - 12 years agoHelpfull: Yes(1) No(0)
- ans s 6....
4C2=6 - 12 years agoHelpfull: Yes(0) No(10)
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