(10!)/((11-r)!) ((13-r)!)/(11!)=30/11=>(...

`(10!)/((11-r)!) ((13-r)!)/(11!)=30/11=>((13-r)!)/((11-r)!)=30 =>(13-r) (12-r)=30`

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(10!)/((11-r)!)((13-r)!)/(11!)=(30)/(11)rArr((13-r)!)/((11-r)!)=30rArr(13-r)(12-r)=30

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`(10!)/((11-r)!) ((13-r)!)/(11!)=30/11=>((13-r)!)/((11-r)!)=30 =>(13-r) (12-r)=30`

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