According to me P = 85 and Q = 10. So, the answer should be 8. But why the expected answer is 500000012?
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perform modular division(Fermat's Theorem) on it you will get that o/p My Solution
Yeah you are right, 85/10 = 8.
I think the authors made a mistake probably.
And we should do a complete retesting for all those who got AC during the contest.
you need to calculate $$$Q^{-1}$$$ mod $$$10^9 + 7$$$ using Fermat's theorem (modular inverse) which is $$$700000005$$$, then multiply it by $$$85$$$ mod $$$10^9 + 7$$$, which is equal to $$$500000012$$$
oh understood. Thanks!