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Hence, when the extremes and number of terms are given, to find the common difference, — Divide the difference of the extremes by the number of terms, less 1, and the quotient will be the common difference.
Practical and Mental Arithmetic: On a New Plan: in which Mental Arithmetic ... - Página 259
por Roswell Chamberlain Smith - 1861 - 280 páginas
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## A Complete Graded Arithmetic: Oral and Written Upon the Inductive Method of ...

James Bates Thomson - 1882 - 396 páginas
...less 1 ; therefore 18-i-9, or 2, is the common difference required. (Art. 764.) Hence, the RULE. — Divide the difference of the extremes by the number of terms less 1. FOEMULA. .-rf, = j !=« 2. The ages of 10 children form an arithmetical series ; the youngest is 3...
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James Bates Thomson - 1882
...1; therefore 18-5-9, or 2, is the common difference required. (Art. 764.) Hence, the RULE.—Divide the difference of the extremes by the number of terms less 1. 2. The age» of 10 children form an arithmetical series; the youngest is 3 yr. and the eldest 30 years;...
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## Complete Arithmetic: Elements and Commercial. New Series

Christian Brothers - 1888
...the difference between the first and the last term, divided by the number of terms less 1. RULE. — To find the common difference, divide the difference of the. extremes by the number of terms less one. W RITTE N EXERCISES. 2. If the number of terms is 30, the first term 13, and the last term 129,...
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## Robinson's New Practical Arithmetic for Common Schools and Academies

Horatio Nelson Robinson - 1892 - 416 páginas
...divide the difference between 2 and 23, 21, by 8 — 1 = 7, and find the common difference 3. RULE. — Divide the difference of the extremes by the number of terms less 1. 2. The first term is 2, the last term is 17, and the number of terms is 6. What is the common difference...
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## Robinson's New Practical Arithmetic for Common Schools and Academies

Horatio Nelson Robinson - 1892 - 416 páginas
...divide the difference between 2 and 23, 21, by 8 — 1 = 7, and find the common difference 3. RULE. — Divide the difference of the extremes by the number of terms less 1. 2. The first term is 2, the last term is 17, and the number of terms is 6. What is the common difference...
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## New Practical Arithmetic: In which the Science and Its Applications are ...

Henry B. Maglathlin - 1894 - 360 páginas
...first term 3, we have 2 X 4, or the product of the common difference by the number of terms less one. Hence, to find the common difference, Divide the difference of the extremes by the number of terms less one. Also, to find the number of terms, Divide the difference of the extremes ly the common differ'...
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## Bradbury's Practical Arithmetic: Combining Oral and Written Exercises

William Frothingham Bradbury - 1895 - 377 páginas
...difference divided by3(15n-3 = 5) gives one of these additions, that is the common difference. Hence, Bule. Divide the difference of the extremes by the number of -terms less one. 91. The extremes of an arithmetical series are 4 and 55, and the number of terms is 1 8 ; what...
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## Higher Book

William Seneca Sutton - 1896
...difference is 129 — 3 = 126. The common difference is 126 -4- 42 = 3. To find the common difference : 343. Divide the difference of the extremes by the number of terms less 1. 4. The first term is .001 ; the last term is 1,000 ; the number of terms is 1,000,000; find the common...
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## Soulé's philosophic practical mathematics: designed for the use of ...

George Soulé - 1910 - 1002 páginas
...sum of all the common differences is equal to the difference between the first and last terms, if we divide the difference of the extremes by the number of terms less one, the quotient will be the common difference; hence the Formula, d = l~^\ for ascending, and d =...
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