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Maths-

General

Easy

Question

If $open parentheses straight a subscript 1 plus ib subscript 1 close parentheses open parentheses straight a subscript 2 plus ib subscript 2 close parentheses horizontal ellipsis horizontal ellipsis horizontal ellipsis. open parentheses straight a subscript straight n plus ib subscript straight n close parentheses equals straight A plus iB$ then $open parentheses straight a subscript 1 superscript 2 plus straight b subscript 1 superscript 2 close parentheses open parentheses straight a subscript 2 superscript 2 plus straight b subscript 2 superscript 2 close parentheses horizontal ellipsis open parentheses straight a subscript straight n superscript 2 plus straight b subscript straight n superscript 2 close parentheses equals$

A-B
A+B
A²-B²
A²+B²

The correct answer is: A²+B²

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If $open vertical bar z subscript 1 minus 1 close vertical bar less than 1 comma open vertical bar z subscript 2 minus 2 close vertical bar less than 2 comma open vertical bar z subscript 3 minus 3 close vertical bar less than 3$ then $open vertical bar z subscript 1 plus z subscript 2 plus z subscript 3 close vertical bar$ is

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