TCS
Company
Numerical Ability
Permutation and Combination
q.1 in how many ways can 3 postcards can be posted in 5 postboxes?
q.2.in how many ways can 5 postboxes hold 3 post cards?
Read Solution (Total 12)
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- q.1 in how many ways can 3 postcards can be posted in 5 postboxes?
first post card can be posted in any of the 5 post boxes =5c1 ways
second post card can be posted in any of the 5 post boxes =5c1 ways
third post card can be posted in any of the 5 post boxes =5c1 ways
number of ways=5c1*5c1*5c1=125=5^3
q.2.in how many ways can 5 postboxes hold 3 post cards?
first post box can hold 3 post cards in 3c1 ways
second post box can hold 3 post cards in 3c1 ways
third post box can hold 3 post cards in 3c1 ways
fourth post box can hold 3 post cards in 3c1 ways
fifth post box can hold 3 post cards in 3c1 ways
so number of ways =3c1*3c1*3c1*3c1*3c1=3^5 - 12 years agoHelpfull: Yes(62) No(3)
- sry frends....previously i posted the wrong answer...
the correct ans will be 3^5 and 5^3 respectively... - 12 years agoHelpfull: Yes(9) No(14)
- 1)5^3
2)3^5 - 12 years agoHelpfull: Yes(8) No(7)
- its 5c2*3! = 60.
3 postcards can be put into 5 postboxes in 5c2 ways and they can be arranged with 3! ways = 6.
thus total no of ways are 60. - 12 years agoHelpfull: Yes(6) No(9)
- is this q's from tcs apti test 2012???
- 12 years agoHelpfull: Yes(4) No(3)
- can any1 please send m tcs new placement pattern urgently on my id nagarkaronkar@gmail.com
- 12 years agoHelpfull: Yes(3) No(4)
- its simple...see....each of the postcard can be out in any of the 5 postboxes...thus each postcard has got 5 option, thus 3 postcard can be put in 3^5 ways.....similarly the second question goes...
- 12 years agoHelpfull: Yes(3) No(6)
- plz give reason why it's answer is 5^3 and 3^5?????
- 12 years agoHelpfull: Yes(0) No(2)
- i think answer should be same in both cases 5^3
- 9 years agoHelpfull: Yes(0) No(0)
- 5^3 and 3^5 ways.
- 9 years agoHelpfull: Yes(0) No(0)
- ans.1 is 125
ans.2 is 10
- 8 years agoHelpfull: Yes(0) No(0)
- both question are similar...................
to select 3 postcard from 5
no. of way will be - 5C3 - 10
1. ans - 10
2. ans -10 - 3 years agoHelpfull: Yes(0) No(0)
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