Probability for SSC CGL
Master Probability for SSC CGL with focused practice questions, exam-specific revision, and review loops.
Practice Questions
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When 5 fair coins are tossed, probability of exactly 4 heads
When 4 fair coins are tossed, probability of exactly 3 heads
When 4 fair coins are tossed, probability of exactly 2 heads
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When 3 fair coins are tossed, probability of exactly 3 heads
When 3 fair coins are tossed, probability of exactly 2 heads
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When 3 fair coins are tossed, probability of exactly 1 heads
When 2 fair coins are tossed, probability of exactly 2 heads
When 2 fair coins are tossed, probability of exactly 1 heads
When 2 fair coins are tossed, probability of exactly 0 heads
A number is selected at random from 1 to 30. What is the probability that it is divisible by 4 or 5?
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Concept Overview
Probability measures the chance that an event will occur. For equally likely outcomes, probability is the number of favourable outcomes divided by the total number of possible outcomes.
SSC CGL focus: Count the sample space carefully, then count only the outcomes that satisfy the condition.
Quick Tricks & Shortcuts
- Write the total number of possible outcomes before counting favourable outcomes.
- For 'not' questions, use complementary probability when it is shorter.
- Check that the final probability lies between 0 and 1.
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