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Drawing balls with **replacement** from an urn:
AIs NOT a sequence of Bernoulli trials
BForms a sequence of Bernoulli trials (probability of success stays the same)
CForms Bernoulli trials only if balls are colourless
DForms Bernoulli trials only when drawing one ball
Answer & Solution
Correct answer: B. Forms a sequence of Bernoulli trials (probability of success stays the same)
With replacement, $p$ stays constant ⇒ Bernoulli. Without replacement, $p$ changes after each draw ⇒ NOT Bernoulli (instead, hypergeometric).
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