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# HELP!!! HELP!!

Find the greatest integer k for which $${ 1991 }^{ k }$$divides

$${ 1990 }^{ { 1991 }^{ 1992 } }$$+ $${ 1990 }^{ { 1991 }^{ 1990 } }$$

I am desperate to know the solution of this good question. Please give the solution in detail.

Note by Kartik Sharma
2 years, 6 months ago