MOMMYDORA
28.10.2020 •
Mathematics
A box contains 14 40W lamps, 28 60W lamps and 58 25W lamps, all the lamps being of the same
size and shape. Three lamps are drawn at random from the box. Determine the probability of:
(i). getting one 25W, one 40W and one 60W lamp, with replacement.
(ii). Getting either one 25W and two 40W or one 60W and two 40W lamps with replacement.
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Ответ:
a. $1300
b. $1326
Step by step explanation:
(a.) $500 + $200 + $600
=$1300 × x(x =1+r)
=$1300
(b.) 1300 ×2
100
= 26