Question

A coin is tossed twice and the outcome is noted every time. Can you say that head must come once in two tosses? Justify your answer

NCERT Class X
Mathematics - Exemplar Problems

Chapter _QUESTION PAPER SET II

Answer 1

Number of possible outcomes :
(HT) (TH) (HH) (TT) = 4
Therefore four outcomes are posssible
Number of head ones in every outcomes:
(HT) (TH) (HH)
Here (HH) is included because head comes atleast once in this outcome
So the number of head onces in every outcome = 3
Probability = Total outcomes /possible outcomes
= 4/3
Therefore number of head appearing once is of probability 4/3.