Write two ways to group and add 4+7+2

Two ways you can group them is:

(4+7)+2

4+(7+2)

They will both give you the same answer of 13.

(4+7)+2                  4+(7+2)

11+2= 13                 4+9= 13

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐

it would be 6xy and -16xy.