JEE Main 2017MathematicsProbabilityEasyMCQ

JEE Main 2017 — Probability Question with Solution

JEE Main 2017 (08 Apr Online)

Question

An unbiased coin is tossed eight times. The probability of obtaining at least one head and at least one tail is:

Choose an option

Show full solutionCorrect option: A
Correct answer
A127128

Step-by-step explanation

Probability of at least one head and at least one tail can be calculated as,

= 1-{PAll Head+PAll Tail}

=1-128+128

=1-127

=1-1128=127128

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About this question

This is a previous-year question from JEE Main 2017, covering the Probability chapter of Mathematics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.