Let xy = z, where x, y,z and nonzero numbers. if x is multiplied by 3 and z is divided by 3, this is equivalent to multiplying y by
a. 1/9 b. 1/3 c. 1 d. 3 e. 9

Y=z/x
 for the second case y₁=(z/3)/3x   =(z/x)*(1/9) =y/9

thus answer is A

I’m not absolutely sure but i think it’s 7x6x5x4x3x2=5040 because as the first character you can take any of the 7 given then you are left with 5 then 6 then 4 etc.