It is 9 to 5 against a person who is 50 years living till he is 70 and 8 to 6 against a person who is 60 years living till he is 80. Find the probability that at least one of them will be alive after 20 years.

Supposing that it is 8 to 7 against a person who is now 30 years of age living till he is 60 and 2 to 1 against a person who is now 40 living till he is 70 , find the probability that at least one of these persons will be alive 30 years hence .

Odds 8 to 5 against a person who is 40 years old living till he is 70 year and 4 to 3 against another person now 50 years till he will be living 80 years. Probability that one of them will be alive next 30 years

Odds 8 to 5 against a person who is 40 years old living till he is 70 and 4 to 3 against another person now 50 till he will be living 80. Probability that one of them will be alive next 30 years .

Odds 8 to 5 against a person who is 40 years old living till he is 70 and 4 to 3 against another person now 50 till he will be living 80. Probability that exactly one of them will be alive next 30 years (59)/(91) 2. (44)/(91) 3. (51)/(91) 4. (32)/(91) 5. (47)/(91)