### Фй лЭне пй чсЮуфет -Уэнфбоз ксйфйкЮт

Ден енфпрЯубме ксйфйкЭт уфйт ухнЮиейт фпрпиеуЯет.

### Ресйечьменб

 INTRODUCTION 1 CHAPTER III 75 CHAPTER IV 152 CHAPTER V 166
 Permutations 205 CHAPTER VIII 211 APPENDIX 231

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 40 - Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
УелЯдб 201 - Three lines are in harmonical proportion, when the first is to the third, as the difference between the first and second, is to the difference between the second and third ; and the second is called a harmonic mean between the first and third. The expression 'harmonical proportion...
УелЯдб 24 - Divide the first term of the dividend by the first term of the divisor, and write the result as the first term of the quotient. Multiply the whole divisor by the first term of the quotient, and subtract the product from the dividend.
УелЯдб 175 - If the product of two quantities be equal to the product of two others, two of them may be made the extremes and the other two the means of a proportion.