Answer:
x =
Step-by-step explanation:
Given
- x =
Multiply through by 28 ( the LCM of 4 and 7 ) to clear the fractions
21 - 28x = 4x ( subtract 4x from both sides )
21 - 32x = 0 ( subtract 21 from both sides )
- 32x = - 21 ( divide both sides by - 32 )
x =
Answer:
(a) 0.0001 or 0.01%
(b) 0.01 or 1%
Step-by-step explanation:
Since there are 10 possible numeric digits (from 0 to 9), and there is only one correct digit, there is a 1 in 10 change of getting each digit right.
The probability that if you forget your PIN, then you can guess the correct sequence
(a) at random:
(b) when you recall the first two digits.