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Maths topic for
Probability:
probability of
an event
By Dhruv Sethi;
dhrsethi1@gmail.com/+91 9310805977
11th Grade
Probability of an Event
Let a sample space of an experiment be
S = {w1, w2, w3, …, wn}
Let all the outcomes be equally likely to occur i.e. the chance of
occurrence of each simple event must be the same.
Σ P(wi) = p for all wi ∈ S where 0 ≤ P(wi) ≤ 1
since Σ P(wi) = p + p +…(n times) … + p = 1
np = 1 i.e. p = 1/n
Probability of an Event
Also, let S be a sample space and E be an event, such that
n(S) = n and n(E)=m. If each outcome is equally likely, then
it follows that
P(E) = m/n = (Number of outcomes favourable to E)/(Total possible
outcomes)
Probability of an Event
• You can contact me for private or group tuitions from the details below
• By Dhruv Sethi: +91 9310805977/dhrsethi1@gmail.com
• Whatsapp: +91 8291687783

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11 Probability of an Event

  • 1. Maths topic for Probability: probability of an event By Dhruv Sethi; dhrsethi1@gmail.com/+91 9310805977 11th Grade
  • 2. Probability of an Event Let a sample space of an experiment be S = {w1, w2, w3, …, wn} Let all the outcomes be equally likely to occur i.e. the chance of occurrence of each simple event must be the same. Σ P(wi) = p for all wi ∈ S where 0 ≤ P(wi) ≤ 1 since Σ P(wi) = p + p +…(n times) … + p = 1 np = 1 i.e. p = 1/n
  • 3. Probability of an Event Also, let S be a sample space and E be an event, such that n(S) = n and n(E)=m. If each outcome is equally likely, then it follows that P(E) = m/n = (Number of outcomes favourable to E)/(Total possible outcomes)
  • 4. Probability of an Event • You can contact me for private or group tuitions from the details below • By Dhruv Sethi: +91 9310805977/dhrsethi1@gmail.com • Whatsapp: +91 8291687783