A sequence of numbers is shown. 1, 3, 17, 115, ... Which describes how to find the next term?
A. Add 14 to the previous term.
B. Add 2 to the previous term.
C. Multiply the previous term by 4, and then subtract 7 from the result.
D. Multiply the previous term by 7, and then subtract 4 from the result.

Question

A sequence of numbers is shown. 1, 3, 17, 115, ... Which describes how to find the next term?
A.		 Add 14 to the previous term.
B.		 Add 2 to the previous term.
C.		 Multiply the previous term by 4, and then subtract 7 from the result.
D.		 Multiply the previous term by 7, and then subtract 4 from the result.

tkhunny · Answer

ANY method one might select.  There are INFINTELY many possiblities.  The question should read, "This sequence was generated by one of the following methods.  Select the one that works."

A: 1+14 = 15 -- That one doesn't work.

B: 1+2 = 3 -- Looking good.
3 + 2 = 5 -- Whoops!  That's not 17.

C: 4*1 - 7 = -3 -- That doesn';t work.  Only one let!

D: 7*1 - 4 = 3 -- Good.
7*3 - 4 = 17 -- Nice.
7*17 - 4 = 115 -- I think we're done.