Step-by-step explanation:

add 3 each terms

8- 1st terms

8+3= 11 -2nd terms

11+3= 14 - 3rd terms

14+3= 17- 4th terms

17+3= 20 - 5th terms

16-5= 11 - 16(number of terms that we are finding), 5(number of terms in the given sequence)

11×3 = 33 + 20(5th terms) = 53 (16th terms)

you can add one by one until you got into 16th terms