Question

The number of different products that can be formed with $8$ prime numbers is

• A. $247$
• B. $252$
• C. $5$
• D. $248$

Answer 1

The correct option is A $247$

A product is defined as multiplication between two or more numbers.
Thus, we need to pick up atleast $2$ numbers from the 8 prime numbers.
$\therefore$ The number of ways $=$ (selecting atleast one) $-$ (selecting only one)
$=2^8-1-{}^8{C}_1=247$