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What is the sum of first 40 natural numb...

What is the sum of first 40 natural numbers? [(1640 , 820 , 410 , 205)]
ii) Whât is the sum of first 40 terms of the arithmetic sequences 6,12,18,.....?
iii) The sum of first 40 terms of an arithmetic sequence with common difference 6 , is '5120 .' Write down the aigebraic form of this sequence.

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V PUBLICATION-ARITHMETIC SEQUENCES-Question Bank
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