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prove ∑k=1nk3=n2(n+1)24
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Solution
QED
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Provebyinduction∑k=1nk3=n2(n+1)24
Check for n=1:נכון
Assume for n=m:∑k=1mk3=m2(m+1)24
Prove for n=m+1:נכון
QED
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