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junior college 2 | H2 Maths
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Why is it that n-1 becomes just n from the first to the second step? Thank you!
Date Posted: 5 years ago
Views: 360
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It’s a simplification of the sum of probabilities, using the equation where the sum of all probabilities = 1.
E.g In a case where we only have 2 outcomes A or B,
P(A) + P(B) = 1
Therefore, P(A) = 1 - P(B)
E.g In a case where we only have 2 outcomes A or B,
P(A) + P(B) = 1
Therefore, P(A) = 1 - P(B)
Date Posted:
5 years ago
This is simply formula for sum to nth term for gp.
T_n=ar-^(n-1)
S_n=a(1-r^n)/(1-r)
T_n=ar-^(n-1)
S_n=a(1-r^n)/(1-r)
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