A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn random
from the box, find the probability that its bears (1) a two-digit number less than 67.
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No of outcome is 58 i.e. 10,11,12,13,14,15,16,17,18,19,20,21...... 68
P(E) = no of outcome ÷total no of outcome
=58 ÷ 90 = 0.6444.......
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