Zadanie 1a
Find x.
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Znaleziono 1343 zadania
Find x.
Find the population standard deviation.
(i) Verify algebraically that C1(n) = n(n − 1) + 1. (ii) The count 421 occurs in this r=1 scheme. Determine its index n.
(i) Show that C1(n) + C1(n + 1) = 2n2 + 2. (ii) Describe this result in words as a rearrangement of tokens into two equal square arrays and isolated tokens. (iii) For n=3 sketch such a rearrangement, distinguishing tokens from the two counts.
Show that 4C1(n) − 3 is the square of an odd integer for every positive integer n.
For r=17 the counts may be written C17(n) = 1 + 34 + 68 + ⋯ + 34(n − 1), with just 1 at n=1. Use an arithmetic-series sum to show that C17(n) = 17n(n − 1) + 1.
Using tables or another suitable method, find the smallest count greater than 1 that occurs in both the r=1 and r=17 schemes.
A weighted version of the counter scheme has , for positive integers r,n. Prove by mathematical induction that Dr(n) = n(n + 1)[2r(2n + 1) + 3]/6.
State u₁.
Given uₙ=−38, find n.