2 & # 178; + 4 & # 178; + 6 & # 178; +. + 50 & # 178; what is equal to In a hurry

2 & # 178; + 4 & # 178; + 6 & # 178; +. + 50 & # 178; = 2 & # 178; (1 & # 178; + 2 & # 178; +. + 25 & # 178;) = 2 & # 178; × {(1 / 6) × 25 × (25 + 1) (2 × 25 + 1)} is left to calculate by oneself. This problem uses the formula: 1 & # 178; + 2 & # 178; +. + n & # 178; = (1 / 6) n (n + 1) (2n + 1)

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