Two coins are tossed simultaneously. Find the probability of getting:
(i) Exactly two heads
(ii) At least one head
Step-by-Step Solution
Key Concept: $S = \{HH, HT, TH, TT\}$ (4 outcomes).<br>(i) Exactly 2 heads: $\{HH\} \Rightarrow P = 1/4$.<br>(ii) At least 1 head: $\{HH, HT, TH\} \Rightarrow P = 3/4$.
(i) $P(2\text{ Heads}) = 1/4$. [1.0 Mark]
(ii) $P(\text{At least 1 Head}) = 3/4$. [1.0 Mark]
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🎯 Official CBSE Marking Scheme:
Part (i) $P(2\text{ Heads}) = 1/4$: 1.0 Mark
Part (ii) $P(\text{At least 1 Head}) = 3/4$: 1.0 Mark
Correct Answer: