rkbilkhu457
26.04.2021 •
Mathematics
HELP NEEDED NOW!!!
Students were asked to write a formula for the length of a rectangle by using the formula for its perimeter,
p= 2l+2w. Three of their responses are shown below.
1.
l=
1
2 P
- W
II.
1
l= (p - 2w)
l=
p - 2w
2
Which responses are correct?
A II and III, only
B I and II, only
© I, II and III
DI and III , only
Solved
Show answers
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Ответ:
27/220.
Step-by-step explanation:
To get £2.50 Pita has to take two pound coins and one 50p coin.
The probability of picking £1 then £1 then 50 p = 3/12 * 2/11* 9/10
= 9/220.
The number of possible arrangements of 2 pounds and 1 50p
= £-£-50, £-50-£ and 50-£-£.
= 3
So the required probability = 3 * 9/220
= 27/220.