There is insufficient information for us to even begin to answer this question. Please edit the question to include more context or relevant information. There is no information on the shape of the two spinners and what colours are on each.
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The answer will depend on the design of each spinner: the number of straight edges and how they are coloured.
There is insufficient information in the question to properly answer it. You did not specify how many places and how many 3's there are on the spinner, and you did not specify the set from which you could pick an "a", both of which are necessary pieces of information to calculate probability. Please restate the question.
They are both measures of probability.
The probability is 2/15.
Spinners have different numbers of sides. Moreover, the sides are not necessarily all equal nor that they are numbered in any particular fashion. The answer depends on these factor. They have not been specified and so the question cannot be answered.
Two out of nine. 2:9.