The missing term in the series 1, 1, 4, 8, 9 ,27, (……) is

Correct option is D

Given : 
1,1,4,8,9,27,(…)

Concept Used : 
The series alternates between squares and cubes

Odd positions follow the pattern of perfect squares:​$$1^2, \; 2^2, \; 3^2, \; \dots$$
Even positions follow the pattern of perfect cubes:$$1^3, \; 2^3, \; 3^3, \; \dots$$
​​​
Solution : 
Odd positions:

• ​$$1^2, \; 2^2, \; 3^2, \; \dots$$
  

Given series:
1
,
1
,
4
,
8
,
9
,
27
,
(
…

)
1,1,4,8,9,27,(…)