Question

Analyze the sequence below and answer the question that follows.

1, 6, 22, 69, 210

Which element in the sequence is a counterexample to the rule?

Rule: Add 1, then multiply by 3 to get the next element.

A.
6
B.
22
C.
69
D.
210

Answer 1

So let's just solve each one until we find one that isn't true :)

Answer 2

So let's start with 1

1 + 1 = 2
2 * 3 = 6

The next element is 6 so 1 is not the counterexample

Answer 3

6 + 1 = 7
7 * 3 = 21

However, the next number in the list is 22 and we got 21...

So 22 is the counterexample

your answer is B

Answer 4

thank you again :)