INTERESTING SUMS

1. 1+3+5 = ?

2. 1+3+5+7 = ?

3. 1+3+5+7+9 = ?

4. 1+3+5+7+9+11 = ?

5. 1+3+5+7+9+11+13 = ?

6. 1+3+5+7+9+11+13+15 = ?

7. 1+3+5+7+9+11+13+15+17 = ?

8. 1+3+5+7+………+289+291+293+295 = ?

9. 1+3+5+7+9+11+13+15+17………………+R = ?

Answers:

1. 1+3+5 = 9 = 32

2. 1+3+5+7 = 16 = 42

3. 1+3+5+7+9 = 25 = 52

4. 1+3+5+7+9+11 = 36 = 62

5. 1+3+5+7+9+11+13 = 49 = 72

6. 1+3+5+7+9+11+13+15 = 64 = 82

7. 1+3+5+7+9+11+13+15+17 = 81 = 92

8. 1+3+5+7+………+289+291+293+295 = 21904 =[(295+1) /2]2

9. 1+3+5+7+9+11+13+15+17………………+R = [(R+1)/2] 2