11th Class
Mathematics
Sample Paper
Maths Olympiad Model Test Paper-10
question_answer
Let \[{{n}_{1}}<{{n}_{2}}<{{n}_{3}}<{{n}_{4}}<{{n}_{5}}\] be positive integers such that \[{{n}_{1}}+{{n}_{2}}+{{n}_{3}}+{{n}_{4}}+{{n}_{5}}=20\]. Then, the number of such distinct arrangements \[({{n}_{1}},\,\,{{n}_{2}},\,\,{{n}_{3}},\,\,{{n}_{4}},\,\,{{n}_{5}})\] is________.