... Therefore, p < 1/1999
1/2
< 1/44. Also,
p =
1998!
(999! · 2
999
)
2
= 2
1998
1998
999
,
while
2
1998
=
1998
0
+ ··· +
1998
1998
< 1999
1998
999
.
Thus p > 1/1999.
4. Let O ... congruent
triangles and then for two points P, Q there is some corner triangle
inside which neither lies; if we assume this corner is at A then the
circle with diameter BC con...
... ∩ BE. The polar of the line AD
is the intersection of the tangents AA and DD, and the polar of
the line BE is the intersection of the tangents BB and EE. The
collinearity of these two intersections ... from Around the World, published by the American Mathemat-
ics Competitions. It contains solutions to the problems from 25 national
and regional contests featured i...
... whenever there is a 0 in the binary
representation of n − k, there is a 1 in the corresponding digit of k.
Then the corresponding
(n−k)
i
k
i
equals 0, and by Lucas’s Theorem
n−k
k
is even.
Therefore, ... Ramsey’s Theorem, either three of them
(call them X, Y, Z) are all adjacent or all not adjacent. But then in
the group {V, X, Y, Z}, none of the players draws exactly once...
... preserve the product of the values of the balls in the box.
This product is initially i
2000
= 1. If three balls were left in the box,
none of them green, then the product of their values would be ... is the altitude to the base of isosceles triangle ACD,
H is the midpoint of CD and hence lies in ω. By the Power of a
Point Theorem, P H · HQ = CH · HD = CH
2
. Because CH is...
... however.
• Though the French are quite formal in their on-stage business dealings, they
usually have an off -the- record web of informal networks that help them get
what they want done in their organizations.
• ... Keep your hands, though not your elbows, above the table.
• The Irish use the continental style, with the fork in the left hand and the knife
in the right.
Gender I...
... between them (increasing the proportion of northern /
southern features the further north / south we go). This division gets increas-
ingly more blurred (by the results of dialect mixing in the nineteenth ... Case study: Southern US English
Americans just simply know about Southern English, whether they speak it
or not. To southerners themselves, their dialect is an important badge of...
... all corners of the world, from the
Fuegian of southernmost Chile to the Inuit of northernmost Alaska,
and from the Maori of the remote Cook Islands to Siberian Yakut.
Some of them describe, ... often takes the form
of willing ill fortune on them. The German
Hals und Beinbruch,
for example, takes the spirit of the English expression ‘break a leg’
and goes one step fur...
... in the least. Passepartout blamed
the captain, the engineer, and the crew, and consigned all
who were connected with the ship to the land where the
pepper grows. Perhaps the thought of the ... sent them forward to Calcutta
by the next train. Owing to the delay caused by the rescue
of the young widow, Fix and the priests reached the Indi-
an capital before Mr....