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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 = 3 2 2. 1+3+5+7 = 16 = 4 2 3. 1+3+5+7+9 = 25 = 5 2 4. 1+3+5+7+9+11 = 36 = 6 2 5. 1+3+5+7+9+11+13 = 49 = 7 2 6. 1+3+5+7+9+11+13+15 = 64 = 8 2 7. 1+3+5+7+9+11+13+15+17 = 81 = 9 2 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

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Page 1: Interesting sums

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

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