Respuesta :

Answer:

72

Step-by-step explanation:

Goes like this:

  • 17+0=17
  • 17+1=18 (1=1^2)
  • 18+4=22 (4=2^2)
  • 22+9=31 (9=3^2)
  • 31+16=47 (16=4^2)
  • 47+25= 72 (25=5^2)

Notice: Here we have squares as difference.