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The ratio of successful students to the failed students is

Among 132 examines of a certain school , the ratio of successful and unsuccessful students is 9:2 .Had 4 more students passed , then the ratio of successful to unsuccessful students will be :

The number of students appeared from a school for the Madhyamik Examination in three consecutive years are in the ratio 7:8:10 and 75%, 87.5% and 93.75% of the students of respective years were successful. What is the percentage of students who were successful during these three years taken together?

Find the probability distribution of the number of success in two tosses f a die,where a success is defined as getting a number greater than 4. Also,find the mean and variance of the distribution.

Find the probability distribution of the number of successes in two tosses of a die,where a success is defined as (i) number greater than 4 (ii) six appears on at least one die

The 4f level is successively filled up in

Find the probability distribution of the number of successes in two tosses of a die, where a success is defined as number greater than 4 appears on at least one die.

Assertion: Every collision of reactant molecule is not successful. Reason: Every collision of reactant molecule with proper orientation is successful one.