I have four identical oranges. How many ways are there for me to divide these oranges into at most three groups?

"At most" connotes 1, 2 or 3 groups

For one group = one wayall of them together

For two groups2 + 2  or 3 + 1  = two ways   ...{the oranges are indistinguishable, so 1 + 3 is the same grouping as 3 + 1 }

For 3 groups = 1 + 1 + 2  = one way   {again, they are indistinguishable}

So ….. four ways

Step-by-step explanation:

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3