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axl_oz
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Please see the attachment... Please explain the answer...



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x2suresh
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axl_oz
Please see the attachment... Please explain the answer...
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10C3*10C3
= 10*9*8/(1*2*3) *10*9*8/(1*2*3)
= 120*120 = 14400
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Ibodullo
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x2suresh, can you please explain your answer? Thanks!!!
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x2suresh
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x2suresh, can you please explain your answer? Thanks!!!
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10 - Republicans
10 - Democrates

Answ= No of Ways choose 3 R out of 10 R * No of Ways choose 3 D out of 10 D
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Ibodullo
x2suresh, can you please explain your answer? Thanks!!!

10 - Republicans
10 - Democrates

Answ= No of Ways choose 3 R out of 10 R * No of Ways choose 3 D out of 10 D
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why would be 10x9x8x10x9x8 wrong?
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x2suresh
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x2suresh
Ibodullo
x2suresh, can you please explain your answer? Thanks!!!

10 - Republicans
10 - Democrates

Answ= No of Ways choose 3 R out of 10 R * No of Ways choose 3 D out of 10 D
why would be 10x9x8x10x9x8 wrong?
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You are using Permutations.. that's valid if order matters..

e.g. consider you have group of 3 repuplicans.. R1 R2 R3
how many ways you will select 2 Repulicans out of 3
Is it 3P2 or 3C2??? will see..

Your answer = 3P2 = 3*2 =6 ways
A1 A2 --A2 A1 <duplicate>
A2 A3 --A3 A2 <duplicate>
A3 A1 --A1 A3 <duplicate>

My answer = 3C2 = 3*2/2! = 3 ways.
A1 A2 =A2 A1
A2 A3 =A3 A2
A3 A1 =A1 A3




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GMAT TIGER
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axl_oz
Please see the attachment... Please explain the answer...
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The question clearly says combination. so permutation doesnot aapply to this case.

No of ways the cgroup can be made = 10c3 x 10c3 = 14,400



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