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CBSE Class 12-science Answered

17th sum plz
Asked by lovemaan5500 | 08 Oct, 2019, 09:44: PM
Expert Answer
One step away means a step forward or a step backward
Either he took 6 forward steps and 5 backward steps or 6 backward steps and 5 forward steps.
Required probability
= 11C6 × (0.4)6 × (0.5)5 + 11C6 × (0.4)5 × (0.6)5
= 11C5 × (0.4)5 × (0.6)5 × (0.4 + 0.6) ... [11C6 = 11C5]
= (11 x 10 x 9 x 8 x 7)/(1 x 2 x 3 x 4 x 5) × (0.24)5
= 0.368
Answered by Sneha shidid | 09 Oct, 2019, 09:40: AM
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