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" The first term, common difference, and number of terms given, to find the .last term, and sum of all the terms. "
The Scholar's Arithmetic: Designed for the Use of Schools in the United States - Side 176
av Jacob Willetts - 1822 - 191 sider
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Mathematics: Compiled from the Best Authors and Intended to be the ..., Volum 1

Samuel Webber - 1801
...and the number of terms behtg given, to find the sum of all the terms. RULE.* Multiply the sum of the extremes by the number of terms,, and half the product will be the answer. EXAMPLES. * Suppose another series of the same kind with the given one be placed under it in...
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The American Preceptor's Assistant: Containing a System of Practical Arithmetic

Jeremiah Paul - 1801 - 222 sider
...term, gives the last term. Then, multiply the sum of the extremes by the number ef terms, ana half-the product will be the sum of all the terms. EXAMPLES. 1. Bought 30 yards of broadcloth, at l:s. for the first yard, 3s. for the second, 5s. tor the third &c. increasing...
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A New and Complete System of Arithmetick: Composed for the Use of the ...

Nicolas Pike - 1809 - 300 sider
...and the number of terms being gi-oent to fnd the fum of all ths terms, RULE. Multiply the fum of the extremes by the number of terms, and half the product will be the anfwer. EXAMPLES. i. The extremes of an arithmetical feries are 3 and 39, and the number of terms i...
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The American Tutor's Assistant Revised: Or, A Compendious System of ...

Zachariah Jess - 1810 - 210 sider
....', by the common difference, and to „that produit add the first term, the sum is the last term.. Secondly, Multiply the sum of the two extremes by the number of terms, and half the produit will be the sum of the series, EXAMPLES. i -Bought 19 yards of shalloon, at \d. for the first...
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The Teachers Assistant. Or, A System of Practical Arithmetic: Wherein the ...

1811 - 198 sider
...less 1, by the common difference, and ,to the product add the first teim, the sum is the last term. 2. Multiply the sum of the two extremes by the number of terms, and half the product will be the sum qf all the terms. f EXAMPLES. •I. The first term 01 a certain series in anumicucoi progression is...
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The Teachers' Assistant, Or, A System of Practical Arithmetic: Wherein the ...

1817 - 198 sider
...difference, and to the product add the first term, the sum is the last term. > 2. Multiply the sum ef the two extremes by the number of terms, and half...product will be the sum of all the terms. EXAMPLES. 1 . The first term of a certain series in arithmetical pro gression is 2, the common difference is 2,...
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Daboll's Schoolmaster's Assistant: Improved and Enlarged. Being a Plain ...

Nathan Daboll - 1817 - 240 sider
...are best understood by an algebraic process, md are here omitted. :, RULE. Multiply the sum of the extremes by the number of terms, and half the product will be the answer. EXAMPLES. 1. The first term of an arithmetical series is 3, the last term 23, and the number...
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Daboll's Schoolmaster's Assistant: Improved and Enlarged. Being a Plain ...

Nathan Daboll - 1818 - 240 sider
...them are best understood by an algebraic process, nnd are here omitted. RULE. Multiply the sum of the extremes by the number of terms, and half the product will be the answer.' EXAMPLES. ^ . 1. The first term of an arithmetical series is 3, the last term 23, and the...
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Logarithmick Arithmetick: Containing a New and Correct Table of Logarithms ...

1818 - 251 sider
...and the number of terms being given, to find the sum of all the terms. RULE. Multiply the sum of the extremes by the number of terms,," and half the product will be the answer. EXAMPLES. 1. The first term of an arithmetical progression is 5, the last term, 60, and the...
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Elements of Arithmetic

Etienne Bézout - 1824 - 219 sider
...by the common difference ; to the product add the first term, and their sum will be the last term. Multiply the sum of the two extremes by the number...product will be the sum of all the terms. EXAMPLES. 1. The first term of a certain series in arithmetical progression is 2, the ratio between the terms is...
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