CAT Question of the Day John is working on an electronic LED board that has 480 LEDs numbered 1 - 480 and placed in ascending order on the board. He programs the board such that all the LEDs are initially switched off. At the end of one second, all the LEDs are switched on and at the end of two seconds, all the LEDs at even places invert their logic state i.e. they get switched off if they are on and get switched on if they are off. After three seconds, all the LEDs numbered 3, 6, 9, … invert their logic state. This pattern continues at the end of each subsequent second. How many LEDs are on just after 3 minutes and 45 seconds have passed?
| OPTIONS | | |  | 1) | 169 | | | 2) | 231 | | | 3) | 249 | | | 4) | 311 |
Tip of the Day Do not go by the length of questions in the verbal area. Difficult questions can be short, whereas lengthy questions, while time-consuming, may be easy. Last year's Question of the day (01-Aug-12) CHORTLE: KANGAROOS ::____________ : ______________
| OPTIONS | | | | | 1) | Gaggle: Geese | | | 2) | Donkeys : Bray | | | 3) | Parliament : Owls | | | 4) | Bleat : Calves |
| 
Comments
Post a Comment