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f(n)=f(n-1)q+(1-f(n-1))pq, f(1)=pq, f(2)=pq(1+q(1-p))
f(n)=f(n-1)q+(1-f(n-1))pq, f(1)=pq, f(2)=pq(1+q(1-p))
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