Question

If the set of factors of a whole number 'n' including 'n' itself but not '1' is denoted by $F\left(n\right),F\left(16\right)\cap F\left(40\right)$ = $F\left(x\right)$ then 'x' is

• A. 4
• B. 8
• C. 6
• D. 10

Answer 1

The correct option is B

8

F(16)={2,4,8,16}

F(40)={2,4,5,8,10,20,40}

F(16)$\cap$F(40)={2,4,8}=F(8)

F(X)=F(8)⟹x=8