27 125 ? 729 1331 2197 3375

1 ? 27 64 125

1 ? 27 64 125

Four of the following five are alike in a certain way and so form a group. Which is the one that does not belong to that group? 1) 27 2) 125 3) 343 4) 729 5) 1321

27 125 343 1331 ? 4313

27: 65 :: 125 : ?

27, 64, 125, 216, 343 ?

Factorise : 27 + 125 a ^(3) + 135 a + 225 a ^(2)

Find the cube roots of the numbers 2460375, 20346417, 210644875, 57066625 using the fact that 2460375=3375 X\ 729 20346417=9261 X\ 2197 210644875=42875 X\ 4913 57066625=166375 X\ 343

Show that: 27 3x\ 64 3=\ 27 x\ 64 3 64 x\ 729 3=\ 64 3x\ 729 3 -125 x\ 216 3=\ -125 3x\ 216 3 -125 3x-1000=-125 3x\ -1000 3