15
5
∘
155
∘

3
5
∘
35
∘

x
∘
x
∘

Where's the question what's happenings

answer: i think it is (1,-2)

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents