The missing number in the Sequence is 54.
A sequence is a series of numbers or expressions such that each consecutive number is increasing or decreasing in a certain fixed amount called as common difference.
The series has a missing number
78,66,__,42,30
Each number in the series has a common difference of 12
And so, the missing number is
= 66-12 = 54
Therefore, the missing number in the Sequence is 54.
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