Information and Communication Technology - Number System
11. When we add 1 to the three-digit greatest number, we get
- Option : B
- Explanation : ∴ 3-digit greatest number is 999 On adding I, we get 999 + 1 = WOO, which is the least 4-digit number.
13. 2234 + 84 - 1273 = x + 123, then find thex.
- Option : A
- Explanation : ∴ 2234 + 84 -1273 = x + 123 ⇒ 2234 + 84 - 1273- 123 = x ∴ x = (2234 +84) - (1273 + 123) = 2318 - 1396 = 922
15. By which of the following, 555555 is divisible?
- Option : D
- Explanation : A number made by writing a digit 6 times is divisible by each of 7, 11 and 13. So, 555555 is divisible by each of 7,11 and 13.
