Question

78,46,30,22,18,16, next missing series

Answer 1

If you first reverse the series, you get :
16,18,22,30,46,78
$16 + {2}^{1} = 18 \\ 18 + {2}^{2} = 22 \\ 22 + {2}^{3 } = 30$


going along the same series we will get
$78 + 64 = 142$

Answer 2

Answer:

142 is the answer.................