Explanation

The sum of the first n natural numbers is given by the formula:

Sum = n(n + 1) / 2

Step 1: Calculate the sum

n = 100

Sum = 100(100 + 1) / 2

= 100 * 101 / 2

= 5050

Explanation

"Have gained" is the present perfect tense.

It shows a completed action with relevance to the present.

Explanation

The Wrap feature allows text to appear on multiple lines within a single Excel cell.

It improves readability without expanding the cell width.

Explanation

Mail merge requires a MAPI-compatible email client to send bulk emails.

Programs like Outlook support MAPI; Gmail can be configured through compatible clients.

Explanation

The musician who performed at the 11th Hyderabad Literature Festival is a famous sitar player.

"Who" is the correct relative pronoun for people.

It properly introduces the clause describing the musician.

Explanation

The subject "Prime Ministers" is plural, so the verb should be plural too.

"Aim" matches the plural subject correctly.

Explanation

Pakistan is famous for its colourful festivals.

"Colourful" is the correct adjective to describe "festivals."

Explanation

Complete Proverb: "A bird in the hand is worth two in the bush."

Meaning:

It is better to hold onto something you already have than to risk losing it by trying to get something better.

Explanation

She missed her flight; consequently, she had to rebook it for the next day.

"Consequently" shows a cause-effect relationship between missing the flight and rebooking.

It properly links the two related actions in sequence.

Explanation

In 2002, Bangladesh became the first country in the world to ban plastic bags after they were found to block drainage systems and cause severe flooding.

The ban was implemented to combat environmental pollution and protect urban infrastructure, especially in Dhaka.