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What is the next term of the sequence 3, 4, 6, 9, 13, 18, 24?

Sagot :

3 + 1 = 4
4 + 2 = 6
6 + 3 = 9
9 + 4 = 13
13 + 5 = 18
18 + 6 = 24
24 + 7 = 31

31

Answer:

The next term is 31.

Step-by-step explanation:

The given sequence is defined recursively as follow

                       [tex]\begin{cases} a_1:=3\\a_k:=a_{k-1}+(k-1) \quad \text{for }k >1\end{cases}[/tex]

Note: This is easy to see by observation.

We will find the next term of the sequence — that is the 8th term. Use the formula for the kth term given above, we get

                     [tex]\displaystyle a_8=a_7+(8-1)=24+7=31[/tex]

Hence, the next term should be 31.