The value of the number is 4.
Series = {6,1,8,4,2,7}
Let the next number in the series be x.
looking at the pattern the series can be classified into two
As the x is falling under the odd number series the,
we can see the difference in the odd series is following -2, +6, -2, +6; therefore, following the same series we get
6 + 2 = 8
8 - 6 = 2
2 + 2 = 4
Hence, the value of the number is 4.
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