A. rectangles 2 and 4 b. rectangles 3 and 4 c. rectangles 1 and 3 d. rectangles 2 and 1

C. Rectangles 1 and 3

Step-by-step explanation:

1. By definition, two rectangles are similar if they have equal shape bot do not have equal sizes.

2. You can know it the rectangle 1 and 3 are similar by the following proportions:

Where is the lenght of the rectangle 1, is the lenght of the rectangle 2, is the width of the rectangle 1 and is the width of the rectangle 2.

3. Subtitute values:

4. Then, the rectangle 1 and 3 are similar.

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⭐

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step-by-step explanation: