Select the set of numbers from the given options which is NOT similar to the given set.
(12, 81, 15)

In each set (except option (c)), the sum of the first and third numbers is multiplied by 3 to obtain the second number.

(12, 81, 15) ==> second number = $$\left(12+15\right)\times\ 3$$ = $$27\times\ 3$$ = 81

Option (a) (11, 69, 12)

second number = $$\left(11+12\right)\times\ 3$$ = $$23\times3\ $$ = 69

In this option, the given logic is applicable.

Option (b) (15, 93, 16)

second number = $$\left(15+16\right)\times\ 3$$ = $$31\times3\ $$ = 93

In this option, the given logic is applicable.

Option (c) (13, 85, 17)

second number = $$\left(13+17\right)\times\ 3$$ = $$30\times3\ $$ = 90

In this option, the given logic is not applicable.

Option (d) (8, 63, 13)

second number = $$\left(8+13\right)\times\ 3$$ = $$21\times3\ $$ = 63

In this option, the given logic is applicable.