Question 698320
since the sequence increases by 3 each time that tells you it's a 3n type of sequence. that's the easy bit.
to get the rest of the sequence.....
a plain old 3n sequence goes 3, 6, 9, 12, 15, ..., (like the 3 times table!)
all the numbers in your sequence (14, 17, 20, ...) are 11 above a plain 3n sequence. that is +11
so the sequence is B. f(n)=11 + 3n