# Probability-1

Tiles in a bag are numbered from $$\left\{ 0,1,2,3,4,\ldots,98,99 \right\}.$$ Two tiles with the numbers $$a$$ and $$b$$ are randomly drawn from the bag with replacement. What is the probability that the number $$3^a+7^b$$ has a digit equal to $$8$$ at the unit place?

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