`**` on `ZZxxZZ` defined by `(a,b)**(c,d)=(a-c,b-d)` for all `(a,b),(c,d)inZZxxZZ.`
Channel: Doubtnut
Date: 2020-05-09

`**` on `ZZxxZZ` defined by `(a,b)**(c,d)=(a-c,b-d)` for all `(a,b),(c,d)inZZxxZZ.`