Pascal's triangle

Show that any two elements (both greater than one) drawn from the same row of Pascal's triangle have greatest common divisor greater than one.  For example, the greatest common divisor of 28 and 70 is 14.

1
1      1
1      2      1
1      3       3       1
1       4       6        4        1
1       5       10        10        5        1
1         6       15       20       15       6       1
1          7         21         35        35       21       7         1


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