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Find the greatest common factor of 15 and 42 .

Find the greatest common factor of 1515 and 4242 .

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Q. Find the greatest common factor of 1515 and 4242 .
  1. Factors of 1515: List the factors of 1515.\newline1×15=151 \times 15 = 15\newline3×5=153 \times 5 = 15\newlineFactors of 1515: 11, 33, 55, 1515
  2. Factors of 4242: List the factors of 4242.\newline1×42=421 \times 42 = 42\newline2×21=422 \times 21 = 42\newline3×14=423 \times 14 = 42\newline6×7=426 \times 7 = 42\newlineFactors of 4242: 11, 22, 33, 66, 77, 1414, 2×21=422 \times 21 = 4200, 2×21=422 \times 21 = 4211
  3. Common factors of 1515 and 4242: Identify the common factors of 1515 and 4242.\newlineFactors of 1515: 11, 33, 55, 1515\newlineFactors of 4242: 11, 22, 33, 424211, 424222, 424233, 424244, 4242\newlineCommon factors of 1515 and 4242: 11, 33
  4. Greatest Common Factor (GCF) of 1515 and 4242: Find the Greatest Common Factor (GCF) of 1515 and 4242.\newlineThe common factors are 11 and 33.\newline33 is greater than 11.\newlineGCF of 1515 and 4242: 33

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