Question

数字推理,2,7,28,63,( ),215,请问()中应填多少?

Answer 1

2=1^3+1 (^3为立方)

7=2^3-1

28=3^3+1

63=4^3-1

()=5^3+1=126

215=6^3-1

因此括号里应该填入126