Pseb 6th Class Sst 2nd Lesson Question/Answer

12 people are asked questions in succession in a random order and exactly 3 out of 12 people know the answer. The probability that the 6^("th") person asked is the 2^("nd") person to know the answer, is

The probability of guessing the correct answer to a certain test questions is x/(12) If the probability of not guessing the correct answer to this question is 2/3 then x = (a)2 (b) 3 (c) 4 (d) 6

In a test paper there are 10 questions . Number of ways in which 6 questions to be answered is

In a class test containing 10 questions, every correct answer is awarded 5 marks, every incorrect answer is awarded (-3) marks, and 0 marks are awarded for every questions not attempted. A student gets 4 questions right, 3 questions wrong, and leaves 3 questions unattempted. What is his score?

Number of children in six different classes are given below. Represent the data on a bar graph.(a) How would you choose a scale.(b) Answer the following questions:(i) Which class has the maximum number of children? And the minimum?(ii) Find the ratio of students of class sixth to the students of class eight.

In a hydrogen spectum if electron moves from 6^(th) to 2^(nd) by transition in multi steps then find out the number of lines in spectum

If in any binomial expansion a, b, c and d be the 6th, 7th, 8th and 9th terms respectively, prove that (b^2-ac)/(c^2-bd)=(4a)/(3c)