If a coin is tossed 10 times then what is the probability of getting three heads?
Total 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
B is 3 years older than A and A is 6 years older than C. If the sum of the age of A and C is 26 years, then find the sum of the ages of all three.
The ratio of the present ages of father and his son is 5:2. The product of their ages 4 years ago was 31 times of his son’s age that year. What wa...
The ages of A, B and C together are 32 years. B is twice as old as A and C is 4 years older than A. What is the difference between ages of B and C?
The ratio of the present ages of father and his son is 7:3. The product of their ages 3 years ago was 32 times of his son’s age that year. What was so...
The total age of A, B and C eight years hence will be 98 years. Find the age of C three years hence, if the present age of A and B is 30 years and 25 ye...
‘A’ is 8 years younger than ‘B’ and 7 years elder than ‘C’. If the present age of ‘B’ and ‘D’ is 20 years and 15 years, respectively...
The ages of A, B and C together are 64 years. B is twice as old as A and C is 4 years older than A. What is the difference between ages of B and C?
The respective ratio of the present ages of A and B is 2:3. The present age of C is 20% more than that of B. The sum of the present ages of A, B and C i...
15 years ago, the average age of all the 40 teachers of the college was 50 years. 8 years ago, the principal has retired from her post at the age of 60 ...
The ratio of the present ages of father and his son is 8:3. The product of their ages 3 years ago was 29 times of his son’s age that year. What was so...
