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There are 5 students in class 10, 6 students in class 11 and 8 students in class 12. If the number of ways, in which 10 students can be selected from them so as to include at least 2 students from each class and at most 5 students from the total 11 students of class 10 and 11 is 100 k, then k is equal to _______.

The train ticket fare from places A to B in 2nd class AC and 3rd class AC is Rs.2,500 and Rs.2,000, respectively. If the fares of 2nd class AC and 3rd class AC are increased by 20% and 10%, respectively, then find the ratio of the new fares of 2nd class AC and 3rd class AC. स्थान A से स्थान B तक रेलगाड़ी का द्वितीय श्रेणी ए.सी. और तृतीय श्रेणी ए.सी. का किराया क्रमशः रु.2,500 और रु.2,000 है। यदि द्वितीय श्रेणी ए.सी और तृतीय श्रेणी ए.सी. के किराए में क्रमशः 20% और 10% की वृद्धि हो जाए, तो द्वितीय श्रेणी एसी. और तृतीय श्रेणी ए.सी. के नए किराए का अनुपात ज्ञात कीजिए।

In class 12 there are 8 students. In class 11 there are 6 students .In class 10 there are 5 students . Total ways of selecting 10 students , such that there are at least 2 students from each class and at most 5 students from 11 students of Class 10 and 11 combined is 100k. Then find value of k