How can a large number be calculated without using a calculator:
(6553719^8 + 6553719^8 + 6553719^8) MOD 10
2026-04-03 15:41:43.1775230903
Exponential Modulus solving large numbers
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Hint: $a^8 \equiv b^8 \mod 10$ if $a \equiv b \mod 10$.
Further hint: use $-1$, not $9$.