Correct Answer - Option 1 : 12 : 78
Given,
8 : 36
The pattern followed here is,
8 : 36 = 8 × 4 + 4 = 36, here 8 is multiplied with 4 (half of 8) and addition of 4 to get number 36.
Similarly,
12 : 78 = 12 × 6 + 6 = 78, her 12 is multiplied with 6 (half of 12) and addition of 6 to get number 78.
Hence, the correct answer is 12 : 78.
Note: In the official question paper, option 4 was 10:42, but as it was generating multiple answers to the question, we have changed the option to 10: 43.