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10 questions from this quiz
Any real number
∣x∣<1|x| < 1∣x∣<1
Infinite series
n(n−1)2!\frac{n(n-1)}{2!}2!n(n−1)
n(n−1)…(n−k+1)k!\frac{n(n-1)\dots(n-k+1)}{k!}k!n(n−1)…(n−k+1)
Truncated for approximations
Repeated application of binomial theorem
12\frac{1}{2}21
Factor out 2122^{\frac{1}{2}}221
n!k!(n−k)!\frac{n!}{k!(n-k)!}k!(n−k)!n!
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