In each of the following questions, identify the wrong number in the series.
21, 28, 33, 35, 37, 36
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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