find the HCF of 30 ,60, 90 and 105
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15 is HCF
.................
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HCF = Highest Common Factor
Factor of 30 - 1, 2, 3, 5, 6, 10, 15
Factor of 60 - 1, 2, 3, 5, 6, 10, 12
Factor of 90 - 1, 2, 3, 5, 9, 10, 15
Factors of 105 - 1, 3, 5, 7, 15
Common among all - 3 × 5 = 15
∴ HCF of 30, 60, 90, 105 is 15
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