Probability-1

Probability Level 5

Tiles in a bag are numbered from {0,1,2,3,4,,98,99}. \left\{ 0,1,2,3,4,\ldots,98,99 \right\}. Two tiles with the numbers aa and bb are randomly drawn from the bag with replacement. What is the probability that the number 3a+7b3^a+7^b has a digit equal to 88 at the unit place?

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