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Secondary 1 | Maths
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4 & 26 are two factors of your unknown number, means that the unknown number is a common multiple of 4 & 26.
just list out the 1st few common multiples of 4 & 26, then check them one by one to see which has exactly 8 factors. the required number is among the 1st 3 smallest common multiples of 4 & 26.
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1, 2, 4, 8, 12, 26, 52 & 104