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Question Number 1132 by 123456 last updated on 24/Jun/15

$$\mathrm{let}\mathrm{S}=\{1,2,3,4,5\},\mathrm{if}\mathrm{A},\mathrm{B},\mathrm{C}\mathrm{is}\mathrm{such}\mathrm{that}$$$$\mathrm{A}\cap \mathrm{B}\cap \mathrm{C}=\varnothing$$$$\mathrm{A}\cap \mathrm{B}\ne \varnothing$$$$\mathrm{A}\cap \mathrm{C}\ne \varnothing$$$$\mathrm{how}\mathrm{many}\mathrm{ways}\mathrm{can}\mathrm{be}\mathrm{choose}\mathrm{A},\mathrm{B}\mathrm{and}$$$$\mathrm{C}$$

Commented by Faaiz Soomro last updated on 14/Jul/15

$$WhenIseethisprobleminthelistthereiswritten$$$$A\cap B=\varphi$$$$A\cap C=\varphi$$$$butnowwhenIamcommentingthereiswrittenunequal$$$$insteadof=sign.Whatistheproblem?Pltrytowritea$$$$commentandnotethis.Whatiscorrect?$$$$Ithinkthisproblemisinmytablet.$$

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