Question

How many divisors of 63 are also divisors of 72? (Recall that divisors may be positive or negative.)

Answer 1

$\boxed{ \tt{Divisor \: of \: 63 :}}$

→ 1 , 3 , 7 , 9 , 21 αɳ∂ 63

$\boxed{ \tt{Divisor \: of \: 72 :}}$

→ 1 , 2 , 3 , 6 , 8 , 9 , 12 , 24 , 36 αɳ∂ 72

${ \boxed{ \tt{♕︎ᴀɴsᴡᴇʀ♕︎}}}$

→ 1 , 3 αɳ∂ 9 are the common divisors