a August 7, 1975

08/07/1975 = 8+7+1+9+7+5 = 37 = 3+7 = 10 = 1 + 0 = 1

b. May 1, 1954

05/01/1954 = 5+1+1+9+5+4 = 25 = 2+5 = 7

c. June 8, 1966

06/08/1966 = 6+8+1+9+6+6 = 36 = 3+6 = 9