JEE Math Practice Question
An unbiased coin is tossed 5 times. Suppose that a variable X is assigned the value of k when k consecutive heads are obtained for k = 3, 4, 5, otherwise X takes the value -1. Then the expected value of X, is :
- A.$$ - {3 \over {16}}$$
- B.$$ - {1 \over 8}$$
- C.$${1 \over 8}$$
- D.$${3 \over {16}}$$
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