Total Questions: 50
4¹²+4¹³+4¹⁴+4¹⁵ ⇒ 4¹² (1 + 4¹ + 4² + 4³) ⇒ 4¹² (1 + 4 + 16 + 64) ⇒ 4¹² (85) 85 is divisible by 17 and hence 17 is the answer.