Question 181
There are four numbers on the board: $1$, $3$, $6$ and $10$. Each time we can erase any two numbers $a$, $b$ written on the board and write numbers $a+b$, $ab$ instead. Can we obtain such four numbers
a) $2015$, $2016$, $2017$, $2018$; after several moves?
b) $2016$, $2017$, $2019$, $2022$
a) $2015$, $2016$, $2017$, $2018$; after several moves?
b) $2016$, $2017$, $2019$, $2022$