Probability of getting exactly four correct answers
A multiple-choice test has 30 questions and each one has five possible answers, of which one is correct. If all answers were guesses, find the probability of getting exactly four correct answers
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A sample of primary standard grade K2Cr2O7 (MM = 294.20) weighing 0.2153g is dissolved, the solution acidified and excess KI added. The liberated I2 requires 44.86ml of the Na2S2O3 for titration.
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