Consider the numbered balls shown. How many 2-digit numbers can be formed using these numbers if...
Consider the numbered balls shown. How many 2-digit numbers can be formed using these numbers if the balls are selected one at a time with replacement? 2,6,3,5,1,7,9
Homework Answers
Answer:
Given Numbers ate 2, 6, 3, 5, 1, 7, 9
There are 2 positions and each position are not allowed to have repeat of the element,
There are total of 7 balls that means 7 numbers from which we have to choose
Therefore,
= 7P1 * 6P1 = 7 * 6 = 42
The number of choices (n) decreases by 1 with each new position because the choices cannot be repeated.
So, there are 42 2-digit numbers can be formed
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