By Dr. Crypton

Combining technology and suspense, Dr. Crypton serves up seventy seven mini-mysteries that the reader can truly clear up. every one tale activates a logical blunders, a wayward truth, or a bemusing riddle. Line drawings. 17,500 print (paper).

**Read or Download Visitors from the Red Planet and 76 Other Solve-Them-Yourself Mysteries PDF**

**Similar puzzles & games books**

**Challenging False Logic Puzzles**

Welcome to the backwards, wrong-way, mixed-up state of Lidd. it is the magical domestic of fake common sense puzzles, and you need to resolve them! simply examine the placement, try the various techniques, and look for inconsistencies. opt for a degree of trouble, from one-star "challenging" puzzles to three-star "mind-expanding" ones.

Booklet by way of Wong, Stanford

**The Official ACBL Encyclopedia of Bridge**

This encyclopedia is an indispensible selection of details and guideline at the card online game bridge. There are entries on historical past, firms, tournaments, ideas, terminology, bidding structures, conventions, card play, go well with mixtures, squeezes, math, biographies, and extra. a brand new structure, 25% greater variety and a brand new index make this version person pleasant.

- Amusements in Mathematics
- Prehistoric Origami: Dinosaurs and Other Creatures
- Wrath of the Immortals (Dungeons & Dragons Game Accessory)
- Caro's Book of Poker Tells
- Kids Pick A Party Book: 50 Fun Themes for Happy Birthdays and Other Parties

**Additional resources for Visitors from the Red Planet and 76 Other Solve-Them-Yourself Mysteries**

**Sample text**

Here we say that, for a given positive integer n, two integers, a and b, are equal modulo n (more often we use the word congruent) if a – b = kn for some integer k. We write this as a ≡ b (mod n). For example, 20 ≡ 2 (mod 6) as 20 – 2 = 18 = 3 × 6. The arithmetic of the integers modulo n follows similar but not identical rules to that of ordinary algebra. We will not call upon the idea too much, except the notation crops up in the explanation of Problem 8 on coding theory. Combinations We will assume familiarity with expansions such as (a + b)2 = a2 + 2ab + b2 and the diﬀerence of two squares: a2 – b2 = (a – b)(a + b).

A famous inﬁnite series is the following: ∞ S= n=1 1 . n2 It comprises an inﬁnite sum of positive terms so it either diverges to +∞, as does for example 1 the sum of reciprocals, ∞ n=1 n , or converges to a limit. To prove that it converges to some limit, we only need to prove that the sum is bounded above by some positive number. This can be done in a number of ways, one of the quickest being the observation that the sum from n = 2 to ∞ is less than the area under the curve y = x12 from x = 1 to ∞.

1 so that (3) applies in all cases. Two consequences of these formulae are n n = k n–k 24 PROFESSOR HIGGINS’ S PROBLEM COLLECTION which follows from (3) and n 2n = k=0 n . k ( 4) To see the latter, put a = b = 1 in (2). Moreover, 2n is the total number of subsets of a set of size n, as the right-hand side of (4) sums the number of subsets of size k of a set of size n as k ranges from 0 up to n. Complex numbers Although not required in the previous problem set, so-called imaginary and complex numbers do arise later and, being numbers, we use this opportunity to outline their properties.