Question
Find the unit digit in (257)45 ×
(248)73.Solution
To find the units digit of (257)45 x (248)773: Units digit of 257 is 7. The pattern for powers of 7 (7, 9, 3, 1) repeats every 4. Since 45 mod 4 = 1, the units digit of 745 is 7. Units digit of 248 is 8. The pattern for powers of 8 (8, 4, 2, 6) repeats every 4. Since 73 mod 4 = 1, the units digit of 873 is 8. Multiply the results: 7 x 8 = 56. Unit digit =6.
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