Bank Exam
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Numerical Ability
Probability
tickets are numbered from 1,2,,,,1100 and one card is drawn randomly what is the probability of having 2 as a digit
Read Solution (Total 2)
-
- Numbers which dont have 2 from 1 to 9 = 8
Numbers which don't have 2 from 10 to 99:
Let us take two places _ _. Now left most place is fixed in 8 ways. Units place is filled with 9 ways. Total 72 numbers.
Numbers which don't have 2 from 100 to 999 =_ _ _ = 8 × 9 × 9 = 648
Numbers which don't have 2 from 1000 to 1099 =10_ _ = 9 × 9 = 81
Finally 1100 does not have 2. So 1.
Total number with no 2 in them = 8 + 72 + 648 + 81 + 1= 810
Tickets with 2 in them = 1100 - 810 = 290
Required probability = 290 / 1100 - 7 years agoHelpfull: Yes(0) No(0)
- probability = 1/1100
- 6 years agoHelpfull: Yes(0) No(0)
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