Prob and stats need help asap An assembler of electronic equ

An assembler of electronic equipment has 20 integrated - circuit chips on her table, and she must solder three of them as part of a larger component. In how many ways can she choose the three chips for assembler ?

Solution

The order in which she obtains them does not matter here.

Hence, there are

20C3 = 20!/[3!(20-3)!] = 20!/[3!17!]

= 20*19*18 / 6

= 1140 WAYS [ANSWER]