Question

If A=(x:x is a factor of 72)andB=(x:x is a multiple of 4 <41).find (A-B) ​

Answer 1

Step-by-step explanation:

{1,2,3,6,9,18}=A-B...,..,.........,......,,...................

Answer 2

$Given \: A = \{ x:x \:is \:a \:factor \:of \:72 \}$

$\implies A = \{ 1,2,3,4,6,8,12,18,24,36,72 \}$

$and \: B =\{ x:x \:is \:a \:multiple \:of \:4\\lt 41 \}$

$\implies B = \{ 4,8,12,16,20,24,28,32,36,40\}$

$\red{ A - B } \\= \{ 1,2,3,4,6,8,12,18,24,36,72 \} - \{ 4,8,12,16,20,24,28,32,36,40\}\\= \{ 1,2,3,6,18\}$

Therefore.,

$\red{ A - B }\green { = \{ 1,2,3,6,18\}}$

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