In an objective paper, there are two sections of 10 questions each.For "section 1", each question has 5 options and only one optionis correct and "section 2" has 4 options with multiple answers and marks for a question in this section is awarded only if he ticks all correct answers. Marks for each question in "sectionl 1" is 1 and in "section 2" is 3. (There is no negative marking.) If a candidate attempts only two questions by guessing, one from "section 1" and one from "section 2", the probability that he scores in both question is `74/75`A. `1//5(1//15)^(3)`B. `4//5(1//15)^(3)`C. `1//5(14//15)^(3)`D. None of these

In an objective paper, there are two sections of 10 questions each.For

1.	In an objective paper, there are two sections of 10 questions each.For "section 1", each question has 5 options and only one optionis correct and "section 2" has 4 options with multiple answers and marks for a question in this section is awarded only if he ticks all correct answers. Marks for each question in "sectionl 1" is 1 and in "section 2" is 3. (There is no negative marking.) If a candidate attempts only two questions by guessing, one from "section 1" and one from "section 2", the probability that he scores in both question is `74/75`A. `1//5(1//15)^(3)`B. `4//5(1//15)^(3)`C. `1//5(14//15)^(3)`D. None of these
Answer» Correct Answer - D Socroing 10 marks from questions can be done in `3+3+3+1=10` ways so as to answer 3 questions from section 2 and 1 question form section 1 correctly. Hence, the required probability is `(""^(10)C_(3)""^(10)C_(1))/(""^(20)C_(4))=1/5((1)/(15))^(3)`

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