Q-11 How many numbers consisting of two digits can be formed from 2, 3 5,7. Each integer is to be used only once. a. 10 b. 12 c. 14 d. 16

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Q-11 How many numbers consisting of two digits can be formed from 2, 3 5,7. Each integer is to be used only once. a. 10 b. 12 c. 14 d. 16

Mathematics
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12
how????
see you have to find the permutations of 2 objects (2 digits) from 4 possible digits. So basically you have to calculate all the ways of arranging 4 things in 2 places. The formula for that is 4P2

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Other answers:

4!/2! = 12
thanks him
or you just think about 4 objects with 2 spaces the first space has 4 ways of being filled, then once we have used that number we only have 3 numbers left, so the second space can be filled in 3ways
then multiply
A square matrix A is symmetric if A = ? a. At b. A c. – A d. A-1
plz solve this
At
how??????
him how
i dont know how..i hate matrices neway..jst try transposing for a symmetric matrix and see
For any positive rational number k, and any real number c, which of the following is incorrect? a. c = c b. c = c c. = 0 d. = 0 e. All are correct 13 minutes ago
him can u plz solve this
i dont unerstand it
a.limxaprochinf c = c b limitxaproch-inf. c = c c.limitxaprochinf c/x^k = 0 d.limitxaprochinfinf c/x^k = 0 e. All are correct
him can u solve it now

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