Answer:
a1 = 3, an = an - 1 + 2
Step-by-step explanation: Notice that Choices (1) and (2) are not recursive formulas, so both can be eliminated.
The first term has 3 triangles and each term after adds 2 more. This is Choice (4).
its 4
Explanation:
a 1 = 3 , a n = a n - 1 + 2
because if you aply this to the shapes that you see at problem 21 you will see that it meaches them
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