Pick the odd one out.

225, 441, 1225, 961, 343

Given: 225, 441, 1225, 961, 343

Let's analyze the given numbers:
225 =15²(Perfect Square)
441 =21²(Perfect Square)
1225 =35²(Perfect Square)
961 =31²(Perfect Square)
343 =7³(Perfect Cube)
All numbers except 343 are perfect squares, while 343 is a perfect cube.
Thus, The Correct option is (c) 343