Abhipraay Bajpai
CAT Preparation Community 10y ago
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Abhipraay Bajpai
CAT Preparation Community 10y ago
Pv Aaditya 10y ago
The expression can be written as $$\sum{n*(n+1)*(n+2)}$$ where 1 <= n <= 50
= $$\sum{n(n^2 + 3n + 2)} = \sum{n^3 + 3n^2 + 2n}$$ where 1 <= n <= 50
= $$(50*51/2)^2$$ + 3*50*51*101/6 + 2*50*51/2 = 1756950
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