 | Edward Bathurst Fackler - Insurance, Life - 1907 - 218 pages
...an arithmetical series multiplied by — , and the rule for finding the sum of such a series is: — "Multiply the sum of the first and last terms by the number of terms and divide the product by two." Here the first term (within brackets) is I — - + ax\ and the last is... | |
 | Edward Bathurst Fackler - Life insurance - 1920 - 216 pages
...arithmetical series multiplied by — , and the rule for finding the sum of such a series is : — " Multiply the sum of the first and last terms by the number of terms and divide the product by two." Here the first term (within brackets) is I + ax\ and the last is ox. The... | |
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Multiply one half the sum of the first and last terms by the number of terms. Thus, the sum of eight terms of the series whose first term is 3 and last term 38 is 8 x * (3 + 38) = 164. 
