Explanation

'PDF' stands for Portable Document Format.

It is a file format used to present and exchange documents reliably across different platforms.

PDF documents are non-editable.

It ensuring document integrity and consistency in viewing.

Charles Geschke, co-founder of Adobe in 1982.

It pioneered the development of PDF software, making it widely adopted globally.

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Explanation

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Explanation

Using "borderless" implies the dissolution of boundaries, reflecting the interconnectedness of global systems.

"Distances" signifies the diminishing significance of physical space due to advancements in communication and transportation technology.

Together, they convey the idea of a world where geographical separations are becoming less relevant.

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Explanation

Illusion: Reality :: Fancy: Fact

In both pairs, the first term represents something that is perceived or imagined,

while the second term represents something that is concrete or true.

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Explanation

Page: Book :: Petal: Flower

Each pair represents a part-to-whole relationship.

A page is a component of a book, and a petal is a component of a flower.

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Explanation

"Made use of" in this context emphasizes the utilization or application of heat for the purpose of driving a machine.

It highlights the intentional action of harnessing heat as an energy source for powering the steam engine.

This phrase emphasizes the deliberate choice and implementation of heat as a driving force, underscoring the significance of this innovation in the development of the steam engine.

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Explanation

The dissimilar pair in the list is "Radio and Transistor".

All the other pairs consist of an object and the substance or item associated with it:

1. Glass contains milk.
2. Bottle holds drink.
3. Pen uses ink.

However, "Radio" is a device, while "Transistor" is a component of a radio.

The other pairs have a direct association between the two items,

whereas in "Radio and Transistor," one is the device itself, and the other is a component of that device.

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Explanation

Multiply the digits and rearrange them according to the pattern.

For 4 x 5 = 1620, the pattern is 4 * 5 = 20 and 4 + 5 = 9.

Apply the same pattern to 3 x 8 and 7 x 6.

Here's the calculation:

For 3 x 8: 3 * 8 = 24 and 3 + 8 = 11, so it becomes 924.

For 7 x 6: 7 * 6 = 42 and 7 + 6 = 13, so it becomes 4942.

Explanation

Assign numerical values to each letter based on its position in the alphabet.

Sum the values of the letters in each word.

For "BOOK," the sum is 43, and for "PEN," the sum is 35.

Apply the same process to "COPY" to find its sum.

Here's the calculation:

B(2) + O(15) + O(15) + K(11) = 43

P(16) + E(5) + N(14) = 35

C(3) + O(15) + P(16) + Y(25) = 59

So, "COPY" equals 59.

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Explanation