Question

you have 1 2 3 4 5 6 8 digits you have to make numbers using all digits without repetition find probability that first and the last digit even

Answer 1

8 / 7 is the probability of even no.

Answer 2

Thus, from triangle DEC, we can say that cosθ=DECD . From the distance formula, we can say the that the length of DE is 12√3 and CD is √32 . Therefore, the angle between two faces is cos−113 . So, the correct answer is “Option B”.