7. A fair penny is tossed three times. The probability of observing a heads two times in a row is a. 1/3 b. 2/3 c. 1/4 d. 3/8 e. 1/2

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7. A fair penny is tossed three times. The probability of observing a heads two times in a row is
a. 1/3
b. 2/3
c. 1/4
d. 3/8
e. 1/2
Transcribed Image Text:7. A fair penny is tossed three times. The probability of observing a heads two times in a row is a. 1/3 b. 2/3 c. 1/4 d. 3/8 e. 1/2
Expert Solution
Step 1: We have given that

A fair penny is tossed three times.

Sample space S={ HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}

Observing a heads two times in a row:A={ HHT, THH, HHH}

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