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10 cards from this deck
Summation
n(n+1)2\frac{n(n+1)}{2}2n(n+1)
n(n+1)(2n+1)6\frac{n(n+1)(2n+1)}{6}6n(n+1)(2n+1)
n2(n+1)24\frac{n^2(n+1)^2}{4}4n2(n+1)2
(∑r)2\left(\sum r\right)^2(∑r)2 (square of sum of integers)
ur=f(r+1)−f(r)u_r = f(r+1) - f(r)ur=f(r+1)−f(r)
∑r=1nur=f(n+1)−f(1)\sum_{r=1}^{n} u_r = f(n+1) - f(1)∑r=1nur=f(n+1)−f(1)
Telescoping series method
Write differences vertically
No, must be memorised
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