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# permutation and combination

A coin is tossed 14 times .heads occur 18 times and tail 6 times . the second and thirteenth tosses are heads then find maximum no of heads that can occur in a row?

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David W. | Experienced ProfExperienced Prof
4.4 4.4 (47 lesson ratings) (47)
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Assuming 14, 8 and 6.

1
12345678901234
H                     H

Since we must use the two given flips of heads, that leaves only six flips to position somewhere (anywhere) in the sequence.  We want a position that creates the maximum number in a row.

Placing six heads in positions 3-8 or in positions 7-12 create a string of 7 heads in a row.  We canâ€™t do any better than that.
MANNY C. | 200+ Testimonials-Most Recommended Wyzant Tutor in USA.200+ Testimonials-Most Recommended Wyzan...
5.0 5.0 (1558 lesson ratings) (1558)
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Did you mean the coin was tossed 24 times?  Or did you mean head occurred 8 times?  One of those needs to be changed.

### Comments

head occurs 8 times