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First realize that: 1+99 = 1002+98 = 1003+97 = 100...If you keep adding this way excluding the number 50, you will get 4900. Next, add 100 and 50 to 4900. The final answer is 5050.
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First realize that:
1+99 = 100
2+98 = 100
3+97 = 100
...
If you keep adding this way excluding the number 50, you will get 4900. Next, add 100 and 50 to 4900. The final answer is 5050.