An investor will randomly select 6 stocks from 20 for an investment. How many total combinations are

Question:

An investor will randomly select 6 from 20 for an investment. How many total combinations are possible? If the order in which are selected is important, how many permutations will there be?
Stocks
Stocks or shares are generally equity instruments that provide the largest source of raising funds in any public or private listed company's. The instruments are issued on a stock exchange from where a large number of general public who are willing...