Exercise · ZW-GROUP-005 · ★☆☆ Basic
What is the inverse of 3 in (ℤ, +)?
Choose one option.
Show answer
- B. −3
Explanation
The additive inverse of 3 is −3, because 3 + (−3) = 0, which is the identity. 1/3 would be the inverse for multiplication, and it is not even an integer.
Review the concept: Group
A group is a nonempty set \(G\) together with an associative binary operation, with an identity element and an inverse for every element.
\[(G,\ast)\]
More practice problems: group
- ZW-GROUP-001 Which list contains the axioms of a group?
- ZW-GROUP-002 Which structure is a group?
- ZW-GROUP-003 Why is (ℤ, ·) not a group?
- ZW-GROUP-004 What is the identity of (ℤ, +)?
- ZW-GROUP-006 Which structure is a group with the indicated operation?
- ZW-GROUP-007 ℕ=\0,1,2,…\ with the usual addition is not a group because...
- ZW-GROUP-008 The identity of a group must...
- ZW-GROUP-009 Which of these conditions is NOT a group axiom?