CBSE 2025 · Region 3 · Set 1 · Q30 · 3 marks
Three unbiased coins are tossed simultaneously. Find the probability of getting:(a)exactly two tails(b)at least one head(c)at most two heads
Three unbiased coins are tossed simultaneously. Find the probability of getting:
(a)
exactly two tails
(b)
at least one head
(c)
at most two heads
Marking-scheme solution
Possible outcomes are HHH, HHT, HTH, HTT, THH, THT, TTH, TTT
(a) P (exactly two tails) \(\displaystyle =\frac{3}{8}\)
(b) P (atleast one head) \(\displaystyle =\frac{7}{8}\)
(c) P (atmost two heads) \(\displaystyle =\frac{7}{8}\)
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CBSE Class 10 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.