What would be the next number in this series? 144 ; 121 ; 100 ; 81 ; 64 ; ??

Question

Can you complete the table series puzzle by replacing the ?? with the correct number?

81   36   144 

??   25   16 

64   100  49

Answer 1

49

12*12 = 144
11*11 = 121
10*10 = 100
9 * 9 = 81
8 * 8 = 64
So,
7 * 7 = 49

Answer 2

One more solution can be:

i = 23  (decrement its value by 2 after each operation, i.e 21, 19, 17, ..)
next_number = number - i

144 - 23 = 121
121 - 21 = 100
100 - 19 = 81
 81 - 17 = 64
 64 - 15 = 49  (Ans)

Answer 3

12^2,11^2,10^2,....................,7^2