Answer all the questions below and press submit to see how many you got right.
Digit : A digit is a symbol used in the representation of a number.
Equation : An equation is a mathematical statement in which two expressions are written with an equal sign in between. A solution of an equation is a set of variables that makes the statement a true statement.
Induction : Induction is a common techniques for proofing mathematical results that are dependent on a natural number $n.$ It consists of first proving the result for a specific $n$, often $n=0$ or $n=1$ (the induction base) and then proving that if it the results holds for all numbers smaller than $n$ that it will then also hold true for $n$ (the induction step.)
Number : A number $x$ is a mathematical symbol representing a quantity.
How many different $n$ digit numbers are there that only use the digits 1 and 2?