Question

15 47 122 ? 511 895 plz answer

Answer 1

The missing number is 266.
Solution: 

47 – 15 = 32, which is square of 4 multiplied by 2.

122 – 47 = 75, which is square of 5 multiplied by 3

895 – 511 = 384, which is square of 8 multiplied by 6.

Therefore, calculating the difference and the internal differences, the missing number may be 266.

So, 266 – 122 = 144, which is square of 6 multiplied by 4.

And, 511 – 266 = 245, which is square of 7 multiplied by 5.