Mission Sirius Black

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To rescue Sirius Black, Harry goes to department of mysteries where many glass spheres are kept.He needs to find the sphere holding prophecy about Harry and Lord Voldemort. He gets vision of two numbers i and j and the sum from ith term to jth term of the sequence 1,4,18,96,600..... gives the shelf number containing that glass sphere. Output the sum modulo 109+7 to help Harry in his mission to re

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solution.cppC++17

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