Explanation:
In mathematics, a combination is a selection of items from a set that has distinct members, such that the order of selection does not matter.
The number of combinations of n objects taken r at a time is determined by the following formula:.
nCr = n! / (n-r)! r!
n = total number of objects in the set
r = number of choosing objects from the set
so here , Jane has 8 toys and first she wants to take 2 toys ....
so , 8C2 = 8! / 6! 2! = 28 ways
so , she selected 2 toys ,,, After she wants to take 2 toys among 6 toys ....
so , 6C2 = 6! / 4! 2! = 15
next , picking 2 toys out of 4
So , 4C2 = 4! / 2! 2! = 6
next , 2C2 = 2! / 0! 2! = 1
total ways to pick toys = 28 × 15 × 6 × 1
= 2520 different ways ..
request :- Sorry if there are some mistakes in my English.