Question

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

Answer 1

12

Answer 2

how????

Answer 3

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

Answer 4

4!/2! = 12

Answer 5

thanks him

Answer 6

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

Answer 7

then multiply

Answer 8

A square matrix A is symmetric if A = ?
a. At b. A c. – A d. A-1

Answer 9

plz solve this

Answer 10

At

Answer 11

how??????

Answer 12

him how

Answer 13

i dont know how..i hate matrices neway..jst try transposing for a symmetric matrix and see

Answer 14

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

Answer 15

him can u plz solve this

Answer 16

i dont unerstand it

Answer 17

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

Answer 18

him can u solve it now