Egyptian mathematics had a unique way of writing fractions as sums of unit fractions – that is, fractions of the form 1 n . For example, the fraction 2 9 could be written as 1 6 + 1 18 and also as 1 5 + 1 45 . They would not represent a number like 2 3 as 1 3 + 1 3 ; they would use two different unit fractions. Unit fractions were written by placing the symbol , which looked somewhat like an eye, over the numeral. For example, 1 3 could be written as . In exercises 79 − 82 , write the given fractions as the sum of unit fractions, using our common notation rather than the cumbersome Egyptian notation. (There may be several correct answers but we will give only one.) 2 7
Egyptian mathematics had a unique way of writing fractions as sums of unit fractions – that is, fractions of the form 1 n . For example, the fraction 2 9 could be written as 1 6 + 1 18 and also as 1 5 + 1 45 . They would not represent a number like 2 3 as 1 3 + 1 3 ; they would use two different unit fractions. Unit fractions were written by placing the symbol , which looked somewhat like an eye, over the numeral. For example, 1 3 could be written as . In exercises 79 − 82 , write the given fractions as the sum of unit fractions, using our common notation rather than the cumbersome Egyptian notation. (There may be several correct answers but we will give only one.) 2 7
Solution Summary: The author explains how to write the tion 27 as a sum of unit tions.
Egyptian mathematics had a unique way of writing fractions as sums of unit fractions – that is, fractions of the form
1
n
. For example, the fraction
2
9
could be written as
1
6
+
1
18
and also as
1
5
+
1
45
. They would not represent a number like
2
3
as
1
3
+
1
3
; they would use two different unit fractions. Unit fractions were written by placing the symbol , which looked somewhat like an eye, over the numeral. For example,
1
3
could be written as. In exercises
79
−
82
, write the given fractions as the sum of unit fractions, using our common notation rather than the cumbersome Egyptian notation. (There may be several correct answers but we will give only one.)
28. (a) Under what conditions do we say that two random variables X and Y are
independent?
(b) Demonstrate that if X and Y are independent, then it follows that E(XY) =
E(X)E(Y);
(e) Show by a counter example that the converse of (ii) is not necessarily true.
7. [10 marks]
Let G = (V,E) be a 3-connected graph with at least 6 vertices. Let C be a cycle in G
of length 5. We show how to find a longer cycle in G.
(a) Let x be a vertex of G that is not on C. Show that there are three C-paths
Po, P1, P2 that are disjoint except at the shared initial vertex and only intersect
C at their final vertices.
(b) Show that at least two of P0, P1, P2 have final vertices that are adjacent along C.
(c) Combine two of Po, P1, P2 with C to produce a cycle in G that is longer than C.
1. Let X and Y be random variables and suppose that A = F. Prove that
Z XI(A)+YI(A) is a random variable.
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