Factorial Range

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Chef has become interested with factorials. Seeing his curiosity, his teacher has given him an exercise to find the sum of factorials from a given range $M$ to $N$ *(The teacher may have given m greater than n in which case the chef should report Answer not possible)*. Now being a beginner he asked Souhandya's help , a Math's genius but Souhandya being a busy person does not have the time and asks

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solution.cppC++17

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