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QUESTION
Q
A consignment of 20 picture tubes contains 5 defectives. Two tubes are selected one after the other at random. The...

Solution

Number of ways of selecting one defective pipe is = 5C1 = 5Number of ways of selecting one pipe from 20 = 20C1 = 20Probability of selecting a defective pipe = 5/20 =...

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Read the passage carefully and answer the following questions. A country under foreign domination seeks escape from the present in dreams of a vanished age, and finds consolation in visions of past greatness. That is a foolish and dangerous pastime in which many of us indulge. An equally questionable practice for us in India is to imagine that we are still spiritually great thought we have come down in the world in other respects. Spiritual or any other greatness cannot be founded on lack of freedom and opportunity, or on starvation and…

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Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 years joins. As a result, average age of…

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A man buys 3 cows and 8 goats for Rs.47,200. Instead if he would have bought 8 cows and 3 goats, he had to pay Rs.53,000 more. Cost of one…

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Simple equations are mathematical expressions that involve one or more variables and follow the basic algebraic form. In these equations, the goal is to find the values of the variables that satisfy the given conditions. Simple equations typically consist of addition, subtraction, multiplication, and division operations, making them fundamental to understanding algebraic concepts.

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