Latest Elitmus Aptitude Question SOLUTION: Find the no f ways you can fill 3x3 grid with 4 corner defined (as a, b, c, d if you have 3 white n 6 blck marbles) a)9C3 b)5C3 c)9c3+6c3 d)(9c3+6c3)/3!

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(#M40153854) ELITMUS Numerical Ability question Keep an EYE

Find the no f ways you can fill 3x3 grid with 4 corner defined (as a, b, c, d if you have 3 white n 6 blck marbles)
a)9C3 b)5C3 c)9c3+6c3 d)(9c3+6c3)/3!

Asked In Elitmus Anjali Sadhukhan (8 years ago)

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Anjali Sadhukhan  (8 years ago)

got the soln..:D ..check out :
As the marbles are identical the required answer is 9C3or 9C6 i.e we can start filing the grid either with white or black marbles.
We have 3 identical white marbles which can be placed in 9 blocks in 9C3 ways and the rest 6 blocks can be filled with 6 white marbles so the required ways of filling the grid is 9C3.

Even if we start filling the 3x3 grid with black marbles the required permutation is 9C6.

so, A) 9C3

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vikash kumar bhardwaj  (8 years ago)

their is no condition to fill the grid wiith either white or black marbles. their r 4 corner so we can do
9c3+6c3

Is this solution Helpfull? Yes (2) | No (4)  

Vipul Pathak  (8 years ago)

Simple....the answer will be 9c3 as...all marbles are identical...so there will 9c3 or 9c6 ways to arrange either of marbles and rest are placed automatically.....so the answer is a..9c3

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