Interesting sums
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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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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