1.  (1331)– (2/3)  =  ?

A. -1/11
B. -11/121
C. 1/121
D. 121/11

Answer: Option C

Explanation:

Cube root of 1331 is 11. Therefore,
 (113)– (2/3)

 Hint: 
 Remember the law of indices (xm)n = xmn

 (11) – 3 × (2/3) = 11–2


 Hint:  x-1  = 1/x

 

11-2  = 1/121