Answer:
300
Step-by-step explanation:
every lamp can connect other lamps ,from the first ,it can connect the other 24 lamps,and then, the second ,can also connect other 24 。but the line between the first and the second is counted twice。
so it would be:
(1+2+3+...+24)×24÷2=300
I think it’s the bottom one
P(Tails) = 1/2
P(2 Tails) = P(Tails) * P(Tails)
P(2 Tails) = 1/2 * 1/2 = 1/4
18 / 2 = 9 || 9 x 3 = 27. Therefore, 27 students are registered in Bob’s class.
Answer:
A = 25π cm²
Step-by-step explanation:
The area (A) of a circle is calculated as
A = πr² ( where r is the radius )
Here diameter = 10, thus r = 10 ÷ 2 = 5, then
A = π × 5² = 25π cm²