Question

Questão 2: Qual alternativa abaixo é composta somente por números múltiplos de 7? a 0.2.4.6.8 e 10 0.3.6. 9.12 e 15. 이 이 0. 5.10.15, 20 e 25 d) 0, 7, 14, 21, 28, 35 e 42​

Answer 1

$\large\boxed{\begin{array}{l}\sf Um\,n\acute umero\, x\,\acute e\,m\acute ultiplo\,de\,y\\\sf quando\,h\acute a\,um\,certo\,k\in\mathbb{N}\,tal\,que\\\sf y=k\cdot x.\\\sf no\,caso\,do\,dos\,m\acute ultiplos\,de\,7\,basta\,fazer\\\sf m(7)=7\cdot k.\\\sf onde\,m(7)\,representa\,os\,m\acute ultiplos\,de\,7\end{array}}$

$\large\boxed{\begin{array}{l}\sf fazendo\,k\,assumir\,os\,valores\,0,1,2,3,4,5\,e\,6\,temos:\\\sf 7\cdot0=0\\\sf 7\cdot1=7\\\sf 7\cdot2=14\\\sf 7\cdot3=21\\\sf 7\cdot4=28\\\sf 7\cdot5=35\\\sf 7\cdot6=42,\\\sf isto\,\acute e, m(7)=\{0,7,14,21,28,35,42.\}\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese\,alternativa\,d}}}}\end{array}}$