In the following question, select the missing number from the given series.
19, 25, 32, 38, 45, 51, ?

Let us inspect the differences between consecutive terms in the series:
25−19=6

32−25=7

38−32=6

45−38=7

51−45=6

The series alternates by adding +6 and +7. Following this pattern, the next increment must be +7:

Missing number=51+7=58