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Question

1323+3343+....+93=

A
425
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B
-425
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C
475
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D
-475
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Solution

The correct option is A 425
1323+3343+....+93=13+23+33+43+....+932(23+43+63+83)=(9×102)16(13+23+33+43)=45216(4×52)2=452402=425

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