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Start learning 50% faster. Sign in nowTotal sample spaces = 2¹⁰ Total favourable events N(P) = ¹⁰C₃ Probability (E) = (N(P))/(N(S)) = (¹⁰C₃ )/(2¹⁰) = (¹⁰C₃ )/(2^5. 2⁵) = ((10 × 12 )/(3 × 2))/(32 × 32) = (10 × 12)/(32 × 32) = 15/128
A is younger than B by 5 years. If the ratio of A and B ages is 7:8 respectively, then find the age of A.
Anil’s present age is 3/8 of his father’s present age. Anil’s sister is 4 years older than him. The ratio between the present age of Anil’s fath...
The ratio of the present ages of Ginni and Binni is 7:3 respectively. Ginni is ‘n’ years older than Binni. If after 5 years, the ratio of the ages o...
A is younger than B by 5 years. If the ratio of A and B ages is 6:7 respectively, then find the age of A.
There are four people P, Q, R and S. R and P are the oldest and youngest among them. Q is older than S. The present age of R is double the present age o...
In two years, the grandson's age will be one-quarter of the grandfather's age. Three years ago, the grandfather was five times as old as the grandson. ...
B is 4 years older than A and A is 8 years older than C. If the sum of the age of A and C is 22 years, then find the sum of the ages of all three.
The ratio of the present age of 'I' to that of 'J' is 7:9. If eight years hence, the ratio of their ages will become 9:11, find the sum of their ages, e...
Present ages of ‘A’, ‘B’ and ‘C’ are in the ratio 10:12:15, respectively. If present average age of ‘A’ and ‘C’ is 50 years, then fi...
The current age ratio of 'A' to 'B' is 5:7, and their combined age is 48 years. The age of 'A', after 'n' years, will equal the age of 'B' from 'n' year...
