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#1
15 ¾ÄȨԡÒ¹ 2014, 11:19
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#3
15 ¾ÄȨԡÒ¹ 2014, 13:49
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 1) ËÒ saple space.........$=10\times 20\times 30=6000$ 2) ËÒ event$(a\leqslant b\leqslant c)$ á¡à»ç¹¡Ã³Õ´Ñ§¹Õé 2.1) $(a,b,c)=(1,b,c)$ áÅÐ $(1\leqslant b\leqslant c)$......¨ÐÁըӹǹ¤ÙèÅӴѺ $\Rightarrow 30+29+28+...+11=410$ 2.2) $(a,b,c)=(2,b,c)$ áÅÐ $(2\leqslant b\leqslant c)$......¨ÐÁըӹǹ¤ÙèÅӴѺ $\Rightarrow 29+28+27+...+11=380$ 2.3) $(a,b,c)=(3,b,c)$ áÅÐ $(3\leqslant b\leqslant c)$......¨ÐÁըӹǹ¤ÙèÅӴѺ $\Rightarrow 28+27+26+...+11=351$ 2.4) $(a,b,c)=(4,b,c)$ áÅÐ $(4\leqslant b\leqslant c)$......¨ÐÁըӹǹ¤ÙèÅӴѺ $\Rightarrow 27+26+25+...+11=323$ ..............·Óä»àÃ×èÍÂæ....... 2.10) $(a,b,c)=(10,b,c)$ áÅÐ $(10\leqslant b\leqslant c)$......¨ÐÁըӹǹ¤ÙèÅӴѺ $\Rightarrow 21+20+19+...+11=176$ $\therefore event=410+380+351+323+...+176=2870$ 3) ¤ÇÒÁ¹èÒ¨Ðà»ç¹.....$=\frac{2870}{6000} =\frac{287}{600}$
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