In each of the following questions, identify the wrong number in the series.
By observing the term of series it is deduced that the series must follow the pattern
21
21 +7 =28
28 +7-2 = 33
33 +7 -2-2 = 36
36 +7-2-2-2 =37
37 + 7 -2-2-2-2 =36
Hence option D is correct
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