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| + | Check out the formula on page 378. It can be used for this question. | ||
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| + | Just list all the possibilities in ad-hoc way and then count them. - Arman Suleimenov | ||
Latest revision as of 21:01, 24 September 2008
Anyone has any idea how to approach this question? -Wooi-Chen Ng
Check out the formula on page 378. It can be used for this question.
Just list all the possibilities in ad-hoc way and then count them. - Arman Suleimenov
