arithematics

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I am very interested in mathematics from the beginning. Every one says that it is a very tough subject. But it is very for me from the begining. I think it is a good exercise of our brain. It gives extra strength to our brain. I don't know the general openion of our viewers . If we are talking of exercise , I will give simple sum to solve this : If the sum of one odd number and other even number is an odd number then the what will be the sum of two even numbers or two odd numbers ? odd + even = odd number even + even = ? odd + odd = ?