exam Maths Puzzle Numerical Ability

S=rg/r-g solve for g

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exam Other Question

Three coins are tossed . Find the probability that no more than one coin lands heads up. is it 5/8, 1/4, 3/8, or 1/2

How do I work this out?

Please help

Ellen WHAT IS THE STANDARD FORM AND HOW DO TRANSFORM A PROBLEM IN TO STANDARD FORM?