Question

Assinale verdadeiro ou falso. a) ( ) 2 · 3! = 6!
b) ( ) 3! + 4! = 7!

Answer 1

Resposta:

a) ( F ) 2 . 3! = 2 . 3 . 2 . 1 = 12 (≠ 6!)

b) ( F ) 3! + 4! = 3 . 2 . 1 + 4 . 3 . 2 . 1 = 6 + 24 = 30 (≠ 7!)

Answer 2

a) (F) pois

$6!=6.5.4.3.2.1=720 \\2.3!=2.3.2.1=12 \\ 12\ne720\rightarrow\,2.3!\ne6!$

b)(F) pois

$3!=3.2.1=6 \\4!=4.3!=4.3.2.1=24 \\ 3!+4!=6+24=30$

$7!=7.6.5.4!=210.24=5040$

$30\ne5040\rightarrow\,3!+4!\ne7!$