Q. Solve this:

Dear student
First we will make 2 parts in this series.27,30,33,3630-27=333-30=336-33=3Now, 25,23,21,?25-23=223-21=2So, 2 is common difference  in this part of series so21-2=19So, missing number is 19.
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The missing place is 29.
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hope it helps and clears your doubt
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