First coin can be placed in one of 25 places. For second, only 16 places
are possible because of the same column and same row condition.
Similarly, only 9 places for third coin. So, total ways = 25 * 16 * 9.
but since coins are identical you can't distinguish one from another and
thus final answer is ( 25*16*9 ) / 3 = 1200.
Feel Free to Let Us Know Your Comment if anything wrong ?
Feel Free to Let Us Know Your Comment if anything wrong ?
6 comments:
whats the answer ? lol, am getting a huge number...3600 :D
I also got the same answer.
25*16*9
Pls let me know if i am correct.
Thanks
Aashish
@all actually its not straight farward . u have just choosen possible place where a,b,c can be placed ..but all are not true because question say that no two number can be in same row , column so above asnwer contains common as well so here is i think the correct one
First coin can be placed in one of 25 places. For second, only 16 places are possible because of the same column and same row condition. Similarly, only 9 places for third coin. So, total ways = 25 * 16 * 9. but since coins are identical you can't distinguish one from another and thus final answer is ( 25*16*9 ) / 3 = 1200.
I am unable to get how it makes any difference if the coins are identical. In any case, for them to be not-in-line, the number of ways will be 25*16*9
I believe it should be 25*16*9/3!
because the coins are identical...
You are right...
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