In the College of Zoology, Mr. Ma gave the students a strange math problem with the title: 1+2+3...+ 100 =? Everyone was dumbfounded. Little rabbit honestly picked up a pencil and counted it on the paper. He kept saying: "1+2 = 3,3+4 = 7 ..."1minute later, piggy came to Mr. Ma with a draft paper and said, "The answer to this question is 5050." Teacher Ma repeatedly praised Piggy as a clever boy, but everyone was puzzled. How can the pig work out the answer so quickly, but he can't? Teacher Ma explained to everyone: "Children, we must find the trick in everything, don't rely on it, and our little pig just found the trick of this problem, so that we can get the numbers quickly." You think, if it's 1, then it will be increased to 99. Then we can use 1+99= 100, 2+98= 100, 3+97= 100 ... in this case, until 49+51=/kloc-. Everyone suddenly realized that they all praised the pig for being smart!