A D20 labelled {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,20} is rolled 8 times, is the probability of at least two consecutive 1s 25599203481/25600000000

score 120 · Answer 8 · 2020-12-16 14:52:55

120

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Prove that recursively defined function is injective and equal to subset

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score 53 · Answer 9 · 2020-12-17 05:57:23

53

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If a function $F$ is defined as $F(x)=F(2x/3) + 1$, where $F(1) = 1$, how can I define the function non-recursively?

Published on 17 Dec 2020 - 5:57

score 696 · Answer 10 · 2026-04-04 07:12:32

696

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How many permutations of the string "000011112222" contain the substring "2020”?

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score 74 · Answer 11 · 2020-12-20 08:56:28

74

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Prove the sequence $\frac{1}{a_n}=1+2f(n)-a_{n-1}$ contains every positive rational number exactly once.

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score 125 · Answer 12 · 2020-12-22 22:38:34

125

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Asymptotics in recurrence relation

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score 102 · Answer 13 · 2026-04-06 05:50:55

102

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Is there a formal name for this recursive sequence?

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score 125 · Answer 14 · 2020-12-23 17:24:30

125

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score 67 · Answer 15 · 2020-12-23 17:55:39

67

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How do I solve the following recursive equation?

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