The chance that an office sprinkler system will fail 20%; chance that the alarm system will fail is 10%; and a chance that both will fail is 4% what is the chance that either the sprinkler or the alarm system will fail ?

A. 26%

Step-by-step explanation:

26% use the addition rule. P(Sprinkler or alarm) = 0.20 + 0. 10 - 0.04  = 0.26.

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step-by-step explanation:

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl