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4, 32, 128, (....)?

Aptitude Quizzes Mathematics Aptitude Test

Question:
4, 32, 128, (....)

Option A):
192
Option B):
256
Option C):
144
Option D):
128

Correct Answer is Option B):
256

Explanation:
The pattern is x8, x4, :.
Missing term = 128 x 2 = 256.