# √3969/? – 19 = 107

(a) 1/4

(b) 1/9

(c) 1/16

(d) 1/25

**Answer: (a) 1/4 **

**Solution:-**

√3969/? – 19 = 107

√3969/? = 107 + 19

√3090/? = 126

63/√? = 126

√? = 63/126

√? = 1/2

Square on both side,

? = 1/4

Then, the value of ? is 1/4.

Hence, the correct answer is option (a) 1/4.