Evaluate
56
Factor
2^{3}\times 7
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4+6+10+15+21
Add 1 and 3 to get 4.
10+10+15+21
Add 4 and 6 to get 10.
20+15+21
Add 10 and 10 to get 20.
35+21
Add 20 and 15 to get 35.
56
Add 35 and 21 to get 56.
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Limits
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