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प्रश्न
Choose the correct alternative:
The value of 2 + 4 + 6 + … + 2n is
विकल्प
`("n"("n" - 1))/2`
`("n"("n" + 1))/2`
`(2"n"(2"n" + 1))/2`
n(n + 1)
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उत्तर
n(n + 1)
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