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Maths-

General

Easy

Question

If $A subscript n end subscript$ is the set of first $n$ prime numbers, then $not stretchy ⋃ from n equals 2 to 10 of A subscript n end subscript equals$

${2,3, 5,7, 11,13,17,19}$
${2,3, 5,7, 11,13,17,19,23,29}$
${3,5}$
${2,3}$

The correct answer is: $left curly bracket 23 comma 57 comma 111317192329 right curly bracket$

Clearly,
$A subscript 2 end subscript subset of A subscript 3 end subscript subset of A subscript 4 end subscript subset of horizontal ellipsis subset of A subscript 10 end subscript$
$therefore not stretchy ⋃ from n equals 2 to 10 of A subscript n end subscript equals A subscript 10 end subscript equals left curly bracket 23 comma 57 comma 111317192329 right curly bracket$

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