CAT Exam Category

Please Tell me the concept to find numbers of solution in such type of problems
i.e. 2a+3b+7c= 326, find the no. of Natural solution, non zero Integer solution, unequal solution and unordered solution.

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CAT Other Question

AVEARGE AGE OF 9 ITEMS IS 79.IF ONE NEW ITEM IS 59 IS ALSO INCLUDED IN THE SERIES ,FIND THE AVERAGE OF ALL THE 10 ITEMS? Rajiv is a student in a business school. After every test he calculates his cumulative average. QT and OB were his last two tests.83 marks in QT increased his average by 2. 75 marks in OB further increased his average by 1. Reasoning is the next test, if he gets 51 in Reasoning, his average will be ___?