If you are only allowed to press the 1 and 0 keys on a calculator with any of the add, take, times, divide and equals keys, what is the fewest number of presses needed to make the number 9 on the calculator?
Enter 38 on a calculator. Now reduce it to 1 by using any operation key and the number 3 only. What is the fewest number of key presses needed (please explain the complete process)?
You need to unlock a secret code using following clues
Clue-1 : 0 7 9 (One of the numbers is correct and is placed in its correct position) Clue-2 : 0 3 2 (Nothing is correct) Clue-3 : 1 0 8 (Two numbers are correct but not placed at its correct position.) Clue-4 : 9 2 6 (One number is correct but not placed at its correct position.) Clue-5 : 6 7 8 (One number is correct but not placed at its correct position.) What is the code?
