one asked to say a two digit number. a) how many two digit numbers are there? b) what is the probability of getting a multiple of 5. c) what is the probability of getting a multiple of 10. d) what is the probability of one of the digit us being zero and other being a prime?
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Correct option is
B
154
⇒ Total number of two digit number =90
⇒ Total number of two digit number which is divisible by 3=30
Out of this there are 6 numbers divisible by 15 (15,30,45,60,75,90) which are also divisible by 5.
⇒ Total two digit number which are divisible by 3 but not 5=30−6=24
⇒ Required probability =9024=154
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