If a random selection is made from 1,2,3,4,5,6 where the digits cannot be repeated, find the probability that the number selected is greater than 4500

Question

anonymous · Answer

how many numbers are selected? 4?

anonymous · Answer

yeah 4 digits; i forgot to mention that sorry

anonymous · Answer

well if > 4500, there are two cases:
1: first number = 4, second = 5
2: first number > 4

anonymous · Answer

isnt the first case 4,5 ,6?

anonymous · Answer

2C1*6P4 + 2C1*5P2?

anonymous · Answer

nope

anonymous · Answer

Are you sure?

anonymous · Answer

yes itcant be that high lol

the probability is 2/5

and from what you got is 14440/360

anonymous · Answer

wait from what you got is 760/360; still not right

anonymous · Answer

(12*6)/(6*5*4*3)

anonymous · Answer

mine 72/360.

anonymous · Answer

i got that as well; still not right

anonymous · Answer

I am sorry. I blew it :( 

First Case. When first digit is greater than 4 i.e {5,6}.

2C1*(5*4*3)

Second Case. When first digit is 4, and second is 5. 

4*3

anonymous · Answer

@Omniscience  2/5 is not right?

anonymous · Answer

72/360 = 1/5 

still not right..

anonymous · Answer

Second Case should be 2*4*3 as the second could be 6 also. I believe I have got the answer.

anonymous · Answer

... second digit* could be ...

anonymous · Answer

yes ishaan got it. thanks

raden · Answer

all case  :
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