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What is the next number in the arithmetic number sequence 4, 9, 16, 25?
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36

Explanation:
Notice that all of the given numbers are square numbers:
$$4=2^{2}, 9=3^{2}, 16=4^{2}, 25=5^{2}$$
So it looks like the intended general term of the sequence is:
$$a_{n}=(n+1)^{2}$$
which would make the next term $a_{5}=(5+1)^{2}=6^{2}=36$

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