Respuesta :

musiclover10045

Using the equations provided in the answers.

The correct answer is C:

7! / (7-2)!2! =

7 * 6*5*4*3*2*1  / 5*4*3*2*1 * 2 *2 =

5040 / 240 = 21

Answer:

C. 7C2 = 7!/(7-2)!2! = 21

Step-by-step explanation:

its a Pascal triangle showing the combination series

the coefficient in question, 21 is the 2nd term (1 doesnt count) on the 7th row

so 7C2 = 7!/(7-2)!2! = 21

ans is C