Find a shortcut for computing the sum: 1+3+5+7++11+13+15+17=?? Explain your shortcut and how you could use this same shortcut to find the sum of all the odd numbers form 45 to 99.

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  1. what is the sum of the 1st and last?
    what is the sum of 2nd and 2nd last ?
    what is the sum of 3rd and 3rd last ?


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  2. 1+17=18




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