The arithmetic sequence is .
Find the common difference by subtracting successive terms.
\The common difference is 3.
\Add 3 to last term of the sequence to get the next termin the sequence.
\Continue adding 3 untill the next three terms are found.
\13 + 3 = 16, 16 + 3 = 19 and 19 + 3 = 22.
The next three terms are 16, 19, 22.