215 = 5 . 43 326 = 2 . 163 with all four numbers prime. Since 215 and 326 do not have prime factors in common, their largest common factor is 1. For that reason, 215 and 326 are said to be co-prime or mututally prime. I think you mean greatest common factor.
215 factors to [5 43]
326 factors to [2 163]
no common prime factors
Answer is 1.■
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