The factors of 1950 are: 1, 2, 3, 5, 6, 10, 13, 15, 25, 26, 30, 39, 50, 65, 75, 78, 130, 150, 195, 325, 390, 650, 975, 1950.
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The factors of 195 are 1, 3, 5, 13, 15, 39, 65, 195. For them to be common, they need to be compared to another set of factors.
The positive integer factors of 1953 are:
1, 3, 7, 9, 21, 31, 63, 93, 217, 279, 651, 1953
The positive integer factors of 1935 are:
1, 3, 5, 9, 15, 43, 45, 129, 215, 387, 645, 1935
195 and 1950
65, 130, 195 The LCM is 195.
1, 3, 5, 13, 15, 39, 65, 195
Yes, 390 is a composite number. It has factors other than 1 and 390. The factors of 390 are 1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, and 390.
The factors of -780 are 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, -1, -2, -3, -4, -5, -6, -10, -12, -13, -15, -20, -26, -30, -39, -52, -60, -65, -78, -130, -156, -195, -260, -390, and -780.