Question

81,7,63. 16,4,? 64,5,40​

Answer 1

Answer:

16

Step-by-step explanation:

81, 7, 63 → 9², 7, 7*9

16, 4, __ → 4², 4, 4*4

64, 5, 40 → 8², 5, 5*8

___________________________

{Just for Fun, Little Mathematics}

Divide 3rd No. by 2nd number and square it to get the 1st Number.

OR

Let three numbers be:

a, b, c

So, We can derive a formula from observing:

a = (c/b)²

Thank you!