Question

Срочно, срочно,срочно!!!!!!

Answer 1

Ответ:   $y_{n}=4n\ ,\ \ n=1,2,3,\ ...$

$\underbrace{4}_{4\cdot 1}\ \ \ ;\ \ \ \underbrace{8}_{4\cdot 2}\ \ \ ;\ \ \ \underbrace{12}_{4\cdot 3}\ \ \ ;\ \ \ \underbrace{16}_{4\cdot 4}\ \ \ ;\ \ \ \underbrace{20}_{4\cdot 5}\ \ \ ;\ ...\\\\n=1\ ;\ \ \, n=2\ \ ;\ \ n=3\ ;\ \ \ n=4\ \ ;\ \ n=5\\\\y_{n}=4n$