c# - What is the way to apply extension methods? -

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समस्या का समाधान करने का प्रयास करते समय

कितने सात-तत्व सबसेट्स (दोहराए जाने योग्य नहीं) क्या नौ तत्वों का एक समूह है?

मैंने कोशिश की 

  IEnumerable & lt; string & gt; NineSet = new string [] {"a", "b", "c", "d", "e", "f", "g", "h", "i"}; Var सेवेनसेट = नौ सेसेट से पहले नौ सेसेट से दूसरे स्थान पर जहां पहले। कॉम्पेरेटो (सेकंड) & lt; 0 और amp; amp; पहले.काउंट () + सेकंड.काउंट () == 7 का चयन करें नया {प्रथम, दूसरा};

समस्या क्या है जो मुझे पहले का उपयोग करने से रोकती है। गणना () और second.Count () ? मैंने जांच नहीं की कि क्या यह समस्या का सबसे अच्छा समाधान है।

पहला और दूसरा स्ट्रिंग हैं, इसलिए आप अपने पात्रों की गणना करेंगे (यह संकलित होता है, लेकिन गहनता इसे छुपाता है)।
आप NineSet.Count (first.Equals) जैसे कुछ की तलाश कर रहे हैं

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