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Number System Flashcards
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Formula
Unit digit cycle = ?
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Answer
2→2,4,8,6 (repeat 4). 3→3,9,7,1. 7→7,9,3,1. 8→8,4,2,6. Find power mod 4 to get position.
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Formula
Divisibility by 9 = ?
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Answer
sum of digits divisible by 9. By 11: alternate sum difference divisible by 11.
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Formula
Product of factors of N = N^(number_of_factors/2). For 72 = ?
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Answer
product = 72^6.
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