5 and 1 you multiple 5*1 to get 5 and add 5+1 to get 6
this formula, doesn't rely on a product, relies on a "sum", or is namely an arithmetic sequence, aₙ₋₁ -3 is another way of saying, the value of the previous term minus 3, so it relies on the ordinal value of a term, so is an recursive formula, well, let's get it when n = 4.

Answer:
Step-by-step explanation:
Ok so the first one is X<31/3
And the second one is X>-5