Question

If 7 smallest squares are chosen at random from a chessboard then the probability that they lie on diagonal, is ?

Answer 1

@shubhamsrg

Answer 2

@DLS

Answer 3

smallest square?

Answer 4

nahi,nahi ho sakta :O galat question hai :|

Answer 5

nvm. i think... i got it. http://www.allinterview.com/showanswers/8354.html

Answer 6

But a better explanation would be even better..

Answer 7

There are total of 64 blocks on a chessboard. So 3 blocks
can be chosen out of 64 in 64C3 ways.

So the sample space is = 41664

There are 2 diagonal on chessboard each one having 8 blocks.
Consider one of them.

3 blocks out of 8 blocks in diagonal can be chosen in 8C3 ways.

But there are 2 such diagonals, hence favourables = 2 * 8C3
= 2 * 56 = 112

The require probability is

= 112 / 41664

= 1 / 372

= 0.002688

Answer 8

hope u got it :)

Answer 9

:/

Answer 10

7 chosen ki 3 chosen ?

Answer 11

7 choslo..

Answer 12

merko samaj agaya shayad :/

Answer 13

oh, 7 choslo hai..hmm
mera to 18/C(64,7) aa raha hai :3

Answer 14

umm. upar 20 hai..
20/64C7..

Answer 15

ohh :O
hmm

Answer 16

merko samaj agaya 20 kyun hai :")

Answer 17

!!!!!!

Answer 18

kyun??

Answer 19

wait upload karta hooon drawing

Answer 20

aa gaya 20
yo
maine 1 diagnol miss kar diya tha

Answer 21

abbe koi mereko btayega? :/

Answer 22

dekho
8 sq. wale 2 diagnols hote hain
7 sq wale 4 diagnols hote hain

hai na?

Answer 23

3 tarah se le sakte hai
8c7 lelia
aur 7c7 aur 7c7 se bhi

Answer 24

baaki green waaale nahi le sakte 7 nahi hai condition satisfy nahi karte

Answer 25

red waala aur 2 green waale hain acceptable case

Answer 26

so 8c7+7c7+7c7

Answer 27

hmm.. 2(8c7+7c7+7c7) nhi krna chahiye? us figure me / vale diagonals hain.. \ vale diagonals?

Answer 28

wahi to kiya :O

Answer 29

mai sirf bracket ke andar ka part bata raha tha

Answer 30

kaise kar lete ho @DLS how? :O

Answer 31

mai sirf ek side ka bata raha hoon

Answer 32

ohho.. ok samajh gya. thank you.

Answer 33

induction :")))

Answer 34

sab clear hojaega isse :|