This uses item model 3 to create number series items - Use of basic algebraic skills.
Usage
imThree(items, n, arith = "add")
Arguments
items
The number of items to generate
n
Value to use the arithmetic operator on
arith
Use either 'add', 'substr', 'multi', 'div'.
Details
Each element in the sequence is derived from the preceding by applying one of four basic arithmetic operations - addition, subtraction, multiplication, or division. Coefficient of change is invariant across the sequence. 20 18 16 14 (12). Currently it only displays up to a series of 9.