In the expression below, each letter represents a one-digit number. where the same letter appears, it represents the same number in each case. each distinct letter represents a different number. in order to make the equation true, what number must replace c? aaa aab + abc 2012

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2