This question was asked in UPSC . Pls answer. give it a try 5 - 4 = 23

1.	This question was asked in UPSC . Pls answer. give it a try 5 - 4 = 23.8 - 1 = 63.6 -16 = 329 - 9 = 783 - 9 = 63 - 81 = ?Explain the logic. Challenge for all masterminds!!
Answer» Given: 5 - 4 = 23, 8 - 1 = 63, 6 -16 = 32, 9 - 9 = 78, 3 - 9 = 6 We have to FIND, the value of 3 - 81 = ? Solution: The patter follow: a - b = $a^{2} -\sqrt{b}$ 5 - 4 = $5^{2} -\sqrt{4}$ = 25 - 2 = 23 8 - 1 = $8^{2} -\sqrt{1}$ = 64 - 1 = 63 6 - 16 = $6^{2} -\sqrt{16}$ = 36 - 4 = 32 9 - 9 = $9^{2} -\sqrt{9}$ = 81 - 3 = 78 3 - 9 = $3^{2} -\sqrt{9}$ = 9 - 3 = 6 Similarly, ? = 3 - 81 = $3^{2} -\sqrt{81}$ = 9 - 9 = 0 ∴ Missing number (?) = 0