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Brain Teasers
Nob’s number puzzle – Solution

Nob’s number puzzle – Solution

At first sight, the puzzle seems to be rather easy. Looking at the first circles on the top: 99 and 72 pointing to 27, it makes sense to assume the following pattern: 92 - 72 = 27. The same pattern continues following the next few circles down the line: 45 - 27 = 18...

Four people on a rickety bridge – Solution

Four people on a rickety bridge – Solution

The initial solution most people come up with is the most obvious one: to use the fastest person, in our family, son Ben, to accompany his family members over the bridge one by one and to go back with the torch each time. This would take 10 + 1 + 5 + 1 + 2 = 19...

Nob’s number puzzle

Nob’s number puzzle

Child psychologists have long since recognised that children learn through games and play. Being in control in play helps them to learn to manage their feelings and when children make or build things in their play, the are building skills and confidence in themselves...

Computability
The Turing Machine

The Turing Machine

The Turing Machine is a model of computation which is reflected in every sort of computer we use today: the computer in my iPhone, the computers in a large scientific establishment, the computers that are attached to the hull of a ship which measure temperature for...

What is computational thinking?

What is computational thinking?

The reason that we think computer science is about computers is pretty much the same reason that the Egyptians thought geometry was about surveying instruments: when some field is just getting started and you don't really understand it very well, it's very easy to...

Propositional Logic

Propositional Logic

In propositional logic, each propositional variable represents a sentence (or proposition), and takes the value TRUE or FALSE, depending on whether the sentences represented by the variables were themselves TRUE or FALSE. The logical connectives are then used to build...

Java
What is object-oriented programming

What is object-oriented programming

Object-oriented programming is concerned with constructing computer systems out of interacting units of software, called objects. Objects know nothing of how other objects work, but they can interact (when a program is executing) by sending messages to each other and...

What is the Java programming language?

What is the Java programming language?

Java was created at Sun Microsystems as a general-purpose programming language similar to C and C++, It is object-oriented and platform-independent. It was originally designed in 1995 for use in consumer electronics. Modern usage include things like writing...

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