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what is x in x^6=6

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TCS Other Question

A girl has to make pizzas with different toppings. There are eight different toppings. In how many ways can she make pizzas with two different toppings? X=99^n.
i)Find the least value of n for which the 1st digit of X is 8.
ii)Find the least value of n for which the 1st digit of X is 7.