Answer: Â a) add n+1 to the previous term
        b) add the previous two terms
        d) subtract n+1 from the previous term
        e) multiply the previous term by 3
        f) subtract 2 from previous term then add 5 to the next term
Step-by-step explanation:
a) 1, 3, 6, 10
  ∨  ∨  ∨
 +2 +3 +4      The next term is 10 +5 = 15
b) 1, 2, 3, 5
  ∨  ∨  ∨
 =3 =5 =8     The next term is 5 + 8 = 13
d) Â 8, 7, 5, 2
   ∨  ∨  ∨
   -1  -2  -3       zThe next term is 2 - 4 = -2
e) 1, 3, 9, 27
   ∨  ∨  ∨
  ×3 ×3 ×3     The next term is 27 × 3 = 81
f) 49, 47, 52, 50, 55
   ∨   ∨   ∨   ∨
   -2  +5  -2  +5    The next term is 55 - 2 = 53
                  The following term is 53 + 5 = 58