I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.
One of them is 20+20+20.
whats the other way ?
Suppose 4 digits 2 ,4,6 and 9 are given. You have to make a four-digit number. In how many ways it can be done, if repetition of the numbers does not allowed?