In each of the following questions, select the missing number from the given responses.
21, 30, 38, ? , 51, 56, 60
The difference between each term decrease by 1 across the series.
30-21 = 9
38-30 = 8
56-51 = 5
Hence the number to be filled in the gap is 45.
45-38= 7
51-45 =6 and so on.
Hence Option D is the correct answer.
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