A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is (i) red ? (ii) not red?

In a pond ecosystem consumers are formed by&nbsp;

Which of the following could affect the rate of function of a pond? (a) The solar input (b) The cycle of temperature (c) Day-length

Primary producers of aquatic ecosystem are

Each of the following is an important factor in determining the productivity of freshwater lakes except

If&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>P</mi><mfenced><mi>B</mi></mfenced><mo>=</mo><mfrac><mn>3</mn><mn>4</mn></mfrac><mo>,</mo><mi>P</mi><mfenced><mrow><mi>A</mi><mo>∩</mo><mi>B</mi><mo>∩</mo><mover accent="true"><mi>C</mi><mo>¯</mo></mover></mrow></mfenced><mo>=</mo><mfrac><mn>1</mn><mn>3</mn></mfrac></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>P</mi><mfenced><mrow><mover accent="true"><mi>A</mi><mo>¯</mo></mover><mo>∩</mo><mi>B</mi><mo>∩</mo><mover accent="true"><mi>C</mi><mo>¯</mo></mover></mrow></mfenced><mo>=</mo><mfrac><mn>1</mn><mn>3</mn></mfrac></math>, then&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>P</mi><mfenced><mrow><mi>B</mi><mo>∩</mo><mi>C</mi></mrow></mfenced></math>&nbsp;is

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is (i) red ? (ii) not red?

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