N choose K is called so because there are (n/k) number of ways to choose k elements, irrespective of their order from a set of n elements.
To calculate the number of happening of an event, N choose K tool is used. N is the sum of data and K is the number that we chose from the sum of data.
The formula for N choose K formula is :
n is the total number
k is the number of selected item
Question 1: How many ways to draw exactly 6 cards from a pack of 10 cards?
From the question it is clear that,
n = 10
k = 6
So the formula for n choose k is,
So, there are 210 ways of drawing 6 cards in a pack of 10.