$\frac{17}{21} \times \frac{3}{5} \\ \\ = \frac{17}{7 \times 3} \times \frac{3}{5} \\ \\ = \frac{17}{7 } \times \frac{1}{5} \\ \\ = \frac{17 \times 1}{7 \times 5} \\ \\ = \frac{17}{35} \\$

6 0

3 years ago

Each signal that a certain ship can make is comprised of 3 different flags hanging vertically in a particular order. How many un

Molodets [167]

Answer:

Step-by-step explanation:

This problem solution involves permutation to calculate number of arrangements of flags. The reason of using permutation in this scenario is that it is mention in the statement that flags are hanging in a particular order and when order is concern we use permutation. According to permutation definition nPr=n!/(n-r)! and so, the unique signals that are made by using 4 flags are 4P3=4!/(4-3)!=24. Here n=total number=4 and r=number chosen=3.

6 0

3 years ago

A triangle has side of length of 18 cm in 6 cm which could be the value of the third side 25 cm or 18 cm￼

A triangle has side of length of 18 cm in 6 cm which could be the value of the third side 25 cm or 18 cm