Algebraic Expression: Converting Circular Pattern Sequences to n-term Formula

Question

Choose the algebraic expression that corresponds to the number of circles in terms of n.

00:00 Find the sequence formula

00:03 Let's observe the number of circles in the first term

00:14 Let's observe the number of circles in the following terms

00:34 Let's substitute the first term in the equation and solve

00:38 We can see that this formula fits our sequence

00:42 Let's use the same method and check all suggested formulas

00:46 This formula doesn't fit our sequence

00:55 This formula doesn't fit either

01:02 And this one doesn't fit either

01:05 And this is the solution to the question

$6-n$