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📐 Mathematics  ·  Relations and Functions  ·  JEE

The Cartesian product A × B where A = {1,2} and B = {a,b} has how many elements?

Answer: 4.

  • A 2
  • B 4
  • C 6
  • D 8

Correct answer: B. 4

Explanation: A x B has |A| x |B| = 2 x 2 = 4 elements: {(1,a),(1,b),(2,a),(2,b)}.

Concept context

Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.

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