Question

2+(2+5)+(2+5+8)+.. .. to n-terms=?​

Answer 1

P(S1)=P(S2)=P(S3)=21

Then circuit will work when S1 is closed or S2 and S3 both are closed.

Hence Total Probability that circuit will work21+(21×21)=21+41=43

Probability that circuit will work=43

Answer 2

Answer:

P(S1)=P(S2)=P(S3)=21

Then circuit will work when S1 is closed or S2 and S3 both are closed.

Hence Total Probability that circuit will work21+(21×21)=21+41=43

Probability that circuit will work=43

Step-by-step explanation: