Question

What's the expression for the given sequence
1, 6, 11, 16...... ?

• A. 5n + 1
• B. 3n + 1
• C. 4n - 1
• D. 2n + 1

Answer 1

The correct option is A 5n + 1

In the given sequence of numbers,

1st number = $5\times 0$ + 1 = 1
2nd number = $5\times 1$ + 1 = 6
3rd number = $5\times 2$ + 1 = 11
4th number = $5\times 3$ + 1 = 16
. .
. .
. .
. .
. .
nth number = $5\times \left(n\right)$ + 1
= 5n + 1

$\therefore$ The expression for the sequence is 5n + 1.