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Answer :

The given sequence : 1.5, 3, 6, 12

Divide second term by first term : 3/1.5=2

Divide the third term by second term : 6/3 =2

Divide the fourth term by third term : 12/6=2

here the geometic ratio is 1.5

So, the given sequence is the geometric sequence

Answer: geometric sequence

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