Explanation

To calculate the number of ways seven people can sit around a table, you can use the formula for permutations of n objects taken r at a time in a circular arrangement:

P(n,r) = (n−1)!

Where n is the number of objects (people) and r is the number of positions to fill (seats).

So, for seven people sitting around a table, there would be 

(7−1)! = 6! ways.

6! = 6 × 5 × 4 × 3 × 2 × 1 = 720

Explanation

Null pointers can be used for various purposes in programming, including as an error value, a sentinel value, and to stop indirection in a recursive data structure.

Explanation

In Microsoft Word, Line Spacing can be used to decide on the spacing between lines of a paragraph.

Explanation

In digital signatures, the public key is known to everyone.

Explanation

The model that involves user reviews throughout the Software Development Life Cycle (SDLC) is: Agile model.

Explanation

Microprocessor works in parallel mode.

Explanation

RAD Model consists of five phases namely:

1. Business modeling
2. Data modeling
3. Process modeling
4. Application generation
5. Testing and Turnover

Explanation

RAD stand for Rapid Application Design

Explanation

Records are referred to in a database as: Rows

Explanation

Purpose of a software engineer includes: Designing and developing software, Managing software projects, Testing and debugging software.