interesting question

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A candidate is required to answer 7 out of 12 questions which are divided into two parts A and B , each containing 6 questions . he is not permited to answer more than 5 questions from either part , The number of ways , he can choose the 7 questions is

#Mathematics #Algebra

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9 Answers

1

skygirl ·2009-03-20 07:11:21

[3]

[6C2x6C5 + 6C4x6C3]X2

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1

Optimus Prime ·2009-03-20 07:22:51

tell the answer

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skygirl ·2009-03-20 07:26:25

780.

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Optimus Prime ·2009-03-20 07:28:11

ur answer is rite , but plz explain the procedure

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skygirl ·2009-03-20 07:33:59

A (6) | B (6)
|
4 from here | 3 from here [similarly reverse]
|
5 from here | 2 from here [similarly reversed]
|

so u will get the above expression.

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Optimus Prime ·2009-03-20 07:35:34

ok thanks

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skygirl ·2009-03-20 07:37:45

[3] this is my frst P-C post in this forum [3]

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Optimus Prime ·2009-03-20 07:40:58

what is a P-C post?

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skygirl ·2009-03-20 07:43:04

permutation-combination post :P

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Your Answer

Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

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° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω