| Joseph Ray - Arithmetic - 1877 - 336 pages
...by 6, the number of 20 — 2 = 18 terms less 1, is 3, the common difference. 1 8 -5- 6 = 3 Bule. — **Divide the difference of the extremes by the number of terms less** one. 2. The extremes are 3 and 300 ; the number of terms 10 : find the common difference. 33. 3. A... | |
| Robert Johnston (F.R.G.S.) - 1879
...terms 7, what is the sum of the series ? 27 3 Sum of extremes •= 30 ; then х ' .i 15x7-105 Ant. 161. **To find the Common Difference. RULE. — Divide the difference of the extremes by** one less than the number of terms. Ex. 2. The extremes are 2 and 39 J and the number of terms 13. «hat... | |
| William Frothingham Bradbury - 1879 - 392 pages
...difference divided by3(15-:-3 = 5) gives one of these additions, that is the common difference. Hence, **Rule. 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 18 ; what... | |
| William Frothingham Bradbury - Arithmetic - 1879 - 446 pages
...divided by 3 (15 4-3 = 5) gives one of these additions, that is the common difference. Hence, Bole. **Divide the difference of the extremes by the number of terms less** one. 91. The extremes of an arithmetical series are 4 arid 55, and the number of terms is 1 8 ; what... | |
| Horatio Nelson Robinson - 1875 - 446 pages
...equal to the common difference multiplied by the number of teTms less 1, (677)> we have the following **RULE. Divide the difference of the extremes by the number of terms less 1** EXAMPLES FOR PRACTICE. 1. If the extremes of an arithmetical series are 3 and 15, and the number of... | |
| James Bates Thomson - Arithmetic - 1882 - 396 pages
...of terms 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... | |
| James Bates Thomson - Arithmetic - 1882 - 416 pages
...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;... | |
| Christian Brothers - Arithmetic - 1888 - 242 pages
...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,... | |
| Horatio Nelson Robinson - Arithmetic - 1892 - 428 pages
...Hence, we 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... | |
| Horatio Nelson Robinson - Arithmetic - 1892 - 416 pages
...Hence, we 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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