Let and . How many ordered pairs satisfy that divides…

MATHEMATICS · Single correct · CBSE · Mathematics · A Square and A Cube · A Square and A Cube

Problem

Let

A=\{1,2,3,4,5\}

and

B=\{1,2,3,4,5\}

. How many ordered pairs

(a,b)

satisfy that

a

divides

b

? (a) 11 (b) 9 (c) 10 (d) 12