Question
The number of five–digit telephone numbers having
at least one of their digits repeated isSolution
The number of five–digit telephone numbers which can be formed using the digits of 0, 1, 2,...., 9 is 105. The number of five-digit telephone numbers which have none of their digits repeated is 10P5 = 10 × 9 × 8 × 7 × 6 = 30240 Hence the required number =105 - 30240 = 69760
24.89² ÷ (34.33 ÷ 20.02) + 67.85 – 89.01 = ?
There are total 200 students in a school, of which 1/5 are boys. Find the number of girls in the school.
If the sum of the digits of a three digit number is subtracted from that number, then it will always be divisible by
__________is the process that connects to a network without the use of cables.
Ehsaan is twice as good a worker as Kamal and together they finish a piece of work in 29 days. In how many days will Kamal, working alone, finish the wo...
(0.04)5 × (0.2)4 ÷ (0.008)2 = (0.2)?
Compute: 1112 ÷ 139 ̶ 5
By which of the following symbol all Excel formula starts?
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Select the correct set of symbols which will fit in the given equation.
5 0 3 5 = 20
