Question

B = {yly is an odd prime number < 4​

Answer 1

$B = \{y/y \:is \:an \:odd\:prime \:number <4\}$

$B = \{ 3\}$

$\underline {\pink { Prime \:number :}}$

Any natural number which has only two factors i.e., 1 and itself is called a prime number .

Example:

2,3,5,7,11,13,...

Therefore.,

$\red { B } \green {= \{ 3\} }$

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