Lisa can paint a wall in four hours. Sissi needs eight hours to paint the wall. How long will it take if they are helped?

It will take very less time actually. we cannot say accurately because if two girls start to chat they will till next day

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⭐