Twenty-one people are to be divided into two teams, the Red Team and the Blue Team. There will be 10 people on Red Team and 11 people on Blue Team. In how many ways can this be done?

352710

Step-by-step explanation:

total number of persons = 21

number of members in red team = 10

number of members in blue team = 11

As we select 10 persons for red team, the rest of the members are in the blue team.

The ways to select 10 persons out of 21

=

Thus, the number of ways to select the 10 members for red team and 11 members for blue team are 352710.

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°