Probability — Formula Sheet
ICSE · Class 7 · Mathematics
6 formulas from Probability (ICSE Class 7 Mathematics) on one page, grouped by topic. Part of the ICSE Class 7 Mathematics syllabus.
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Formulas and Key Relations
1. Core Ideas
P(E) = Number of trials in which the event happened / Total number of trials
Probability = Number of favourable outcomes / Total number of outcomes
P(E) + P(E') = 1
4. Complementary Events
P(E) = 1 - P(E')
Solved Examples and Answer Patterns
For a coin tossed 40 times with 14 heads, probability of head = 14/40 = 7/20.
For the same experiment, probability of tail = 26/40 = 13/20.
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