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`        wat is 1+3+5+7+9+11+......99 =  ?how to do it fast`
4 years ago

```							there are total 50 consicutive odd numbers strating from 1 therefore  sum is (number of terms)^2 ,hence answer is 50^2=2500 is the answer
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4 years ago
```							lets add the first number and the last number1 + 99 = 100lets add the second number and the second last number3 + 97 = 100like that it goes on5 + 95 = 1007 + 93 = 1009 + 91 = 100......49 + 51 = 100like this there are twenty five set of numbers so 25 × 100 = 25002500 is the answer
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4 years ago
```							wow what an answer by @arun krishna
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4 years ago
```							this answer can be solved by arithmetic progression..where a = 1, an=99 n=50 Sn=n/2(a+an)=25(100)=2500..
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4 years ago
```							for such type of questions add first term and last term then multipy with total then divide by 2 for ur case {1+99}*50/2 and u will get the answer.
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4 years ago
```							Sum of n odd terms is
```
4 years ago
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