Find the remainder which `7^(103)` is divided by 25.
Find the remainder which `7^(103)` is divided by 25.
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Correct Answer - 18
`(7^(103))/(25) = (7(49)^(51))/(25)`
`= (7(50-1)^(51))/(25)`
`= (7(25k - 1))/(25)`
`= (175(k) - 25 + 25 -7)/(25)`
`= (25(7k - 1)+18)/(25)`
`= (25(7k-1)+18)/(25)`
Therefore, the remainder is 18.
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