Answer:
b. 840
Step-by-step explanation:
so ( 7 * 6 * 5 * 4 * 3 * 2 * 1 ) / ( 3 * 2 * 1 )
→ 5040 / 6
→ 840
[tex]\\ \tt\longmapsto \dfrac{7!}{3!}[/tex]
[tex]\\ \tt\longmapsto \dfrac{7(6)(5)(4)(3!)}{3!}[/tex]
[tex]\\ \tt\longmapsto 7(6)(5)(4)[/tex]
[tex]\\ \tt\longmapsto 42(20)[/tex]
[tex]\\ \tt\longmapsto 840[/tex]
