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Tyrese Nolan

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3y ago
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14y ago

Given that a is a whole number, then twice a must be an even number, being a multiple of 2. One less than any even number is an odd number.

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Q: Prove 2a-1 is odd
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What is the formula to find sum of n odd numbers?

The set of odd numbers is an arithmetic sequence. Let say that the sequence has n odd numbers where the first term is a1 and the last one is n. The formula to find the sum on nth terms for an arithmetic sequence is: Sn = (n/2)(a1 + an) or Sn = (n/2)[2a1 + (n - 1)d] where d is the common difference that for odd numbers is 2. Sn = (n/2)(2a1 + 2n - 2)


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