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Quantitative Aptitude > Learn Quantitative Aptitude > What's the remainder of 7^20/17?
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What's the remainder of 7^20/17?

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7^20 = 7^16 * 7^4 According to Fermat's little theorem 7^16 when divided by 17, the remainder is 1. Now the number is reduced to 1*7^4 7^4 = 49*49=15*15=225 When 225 is divided by 17, the remainder is 4.
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The remainder is 4
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