this is easy... but i am not gettin it

what is the probability of getting two consecutive heads in 5 tosses of an unbiased coin?

6 Answers

21
tapanmast Vora ·

getting two this implies Exactly or Atleast ??

1
kartik sai ·

i think it is at least...but give me the ans for both......

1357
Manish Shankar ·

lets calculate for non consecutive

For all 5 tails , no. of ways=1
for 4 tails no. of ways=5

for 3 tails no. of ways=6 (find it how)

for 2 tails no. of ways is 1 (which one)

for 1 tail no way

for 0 tail no way

so total no. of ways=1+5+6+1=13

probability, p=13/32

probability of getting two consecutive heads=1-p=19/32

1
kartik sai ·

but sir the ans is 13/32 !!!!!!

62
Lokesh Verma ·

Cases: We have 2 heads

no of ways = 4

When we have 3 heads, The number of ways of getting 2 consecutive heads is 3+ 2 + 2 ways

When we have 4 heads then the number of ways of getting 2 consecutive heads is 5

If there is 5 head, the number of ways of getting 2 consective heads is 1

So the toal way sof getting heads is 13

total ways of getting the 5 coins tossed is 32

Probability is 13/32

13
Двҥїяuρ now in medical c ·

but if it is atleast...then it should be...

HH*** 8 cases
THH** 4 cases
*THH* 4 cases
**THH 4 cases

Total no. of favourable cases 20

probability=20/32=5/8

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