Severity: Warning

Message: count(): Parameter must be an array or an object that implements Countable

Filename: controllers/formulas.php

Line Number: 37

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In order to choose 4 numbers, there are 10 numbers given.

Since repetition is allowed, while choosing the first number there are 10 possibilities.

While choosing the second number, there are again 10 possibilities or choices to choose from!

Similarly, for the third and fourth numbers, there are 10 possibilities each time.

If there are ‘n’ number of things to choose from, and ‘r’ things are to be selected where repetition is not

allowed and considering the order of arrangement, then the Permutations formulas is given by:

r)!

So, given n = 6 pencils and r = 3 pencils.

==> 6!/ 3! = 6 * 5 * 4 =