# Find the missing number

(a) 324

(b) 289

(c) 441

(d) 361

**Answer: (a) 324**

**Explanation:-**

The square root of 169 = 13,

The square root of 64 = 8,

The square root of 81 = 9

Then, the sum of the square roots = 13 + 8 + 9 = 30.

The square root of 1296 = 36,

The square root of 576 = 24,

The square root of 100 = 10.

Then, the sum of the square roots = 36 + 24 + 10 = 70.

Same as,

The square root of 625 = 25,

The square root of 49 = 7,

The square root of( ? )^1/2 =

Then,

25 + 7 + ? = 50

? = 50 – 32

? = (18)^2

? = 18 x 18

? = 324.

Hence, the correct answer is option (a) 324.