bernie24
28.02.2020 •
Mathematics
Consider a collection of envelopes consisting of 3 red envelopes ​, 2 blue envelopes ​, 1 green envelope ​, and 3 yellow envelopes . If three envelopes are selected at​ random, without​ replacement, determine the probability that they are all yellow envelopes.
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Ответ:
1/84
Step-by-step explanation:
3+2+1+3 = 9
3/9 × 2/8 × 1/7 = 1/84
= 0.0119047619
= 0.0119 (3 sf)
Ответ:
StatementReason
AB and BC are congruent
CPCTC
DB and FB are congruent
CPCTC
Angle EBD congruent to angle EFB
CPCTC
Angle ABD congruent to angle EBD
Alternate angle theorem
Angle FBC congruent to angle EFB
Alternate angle theorem
ABD CBF
SAS theorem