which number should replace both the asterisks in ( * / 21 ) x ( * / 189 ) = 1 ?
"answer let ( y / 21 ) x ( y / 189 ) = 1 then , y 2 = 21 x 189 = 21 x 21 x 9 ∴ y = ( 21 x 3 ) = 63 . option : b"
sqrt(multiply(189, 21))