Explanation

De Morgan's laws describe relationships between unions and intersections of sets.

They are also fundamental in logic and Boolean algebra.

Explanation

The preposition "in" is used for months, years, and long periods.

Therefore, "in January" is the correct usage.

Explanation

Copper is a good conductor of heat.

That's why it’s used in cooking utensils and electrical wiring.

Wood, plastic, and glass are poor conductors (insulators), meaning they do not transfer heat easily.

Explanation

Let's denote the width as w and the length as 3w (since the length is thrice the width).

The area of the window is:

w × 3w = 3w²

Given area = 18.75 sqm

3w² = 18.75

w² = 18.75 / 3

w² = 6.25

w = √6.25

w = 2.5

Length = 3w

= 3 × 2.5

= 7.5

Explanation

The Least Common Multiple (LCM) of 3 and 4 is 12, the smallest number divisible by both.

Multiples of 3: 3, 6, 9, 12...

Multiples of 4: 4, 8, 12...

Explanation

Square of -6 means (-6) × (-6) = 36.

Negative × Negative = Positive.

Explanation

Explanation

A rational number is a number that can be written as a fraction (p/q) where p and q are integers and q ≠ 0.

3/0 is a rational number.

Explanation

Pakistan's largest food crop is wheat.

As of 2018, According to the Ministry of Agriculture, Pakistan's wheat output reached 26.3 million tonnes.

The most important crops which together account for nearly more than 75% of the value of total crop output are:

• Wheat
• Sugarcane
• Cotton
• Rice

Explanation

Gmail is an email service, not a web browser.

Mozilla Firefox, Google Chrome, and MS Edge are all web browsers used to access websites.