Easy, it says "for ANY positive integer" so just test any positive integer
remember that n! means times all integers from 1 to that number n
lets try 1
(1+1)!/(1!)-1= (2!)/(1!)-1= 2/1-1= 2-1= 1
if you don't believe me, try 2 (2+1)!/(2!)-2= (3!)/(2!)-2= (6)/(2)-2= 3-2= 1
te answer is 1, B
and number 9 easy, remember the exponential law (x^m)(x^n)=x^(m+n) jsut add the exponents first gropu like bases (r^2r^2/3)(t^1/2t^-3/2) add bases (r^2 and 2/3)(t^-1)= (r^2∛(r^2))(1/t)=