In some code, letters, a, b, c, d and e represent numbers 2, 4, 5, 6 and 10. However, we don't know which letter represent which number. Consider the following relationships:
i. a + c = e ii. b – d = d iii. e + a = b
b = 4, d = 2
a = 4, e = 6
b = 6, e = 2
a = 4, c = 6