18. निम्न में कौन से युग्म समतुल्य भिन्न हैं- \( \begin{array}{lll}\text { (a) } \frac{-13}{9}, \frac{39}{-27} & \text { (b) } \frac{3}{-7}, \frac{-18}{42} & \text { (c) } \frac{15}{14}, \frac{-225}{-210} \\ \text { (d) } \frac{-2}{3}, \frac{3}{2} & \text { (e) } \frac{3}{11}, \frac{-3}{11} & \text { (f) } \frac{7}{-19}, \frac{-28}{76}\end{array} \)

Given a system of linear equations. \[ \begin{array}{l}x-2 y+z=2 \\ b x+a y=3 \\ -2 y+z=-4\end{array} \] Choose appropriate values for \( a \) and \( b \), a. solve the SLE by using matrix equation, where get the inverse matrix by using i. elementary row operation

One component is main memory. Describe what is meant by main memory and how it is used in the Von Neumann model for a computer system

б) Для подготовки реферата Павел скачал 120 мегабайт информации за 3 мин. Сколько времени потратит на скачивание этой информации Полина, если у иее́ скорость скачивания этого же файла на 10 мегабайт в минуту меньше, чем у Павла? 9 Выполните действия:

Soit lévénement \( A \) : "Un élève a réussi lexamen". Quelle est la signification de lévénement contraire \( \bar{A} \) ?

A Small Scale Manufacturer produces two types of Products A and B which gives a profit margin of AED 70 and AED 50 respectively. There are two plants I and II, each having a capacity of 240 and 100 hours. Cycle time of A and B are 4 hours and 3 hours in plant I and 2 hour and 1 hour in Plant II. How many products of A and B to be manufactured? Formulate the problem.