## Question 50

The probabilities that a man and his wife live for 80 years are $\tfrac{2}{3}$and $\tfrac{3}{5}$respectively. Find the probability that at least one of them will live up to 80 years

Maths is funny

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The probabilities that a man and his wife live for 80 years are $\tfrac{2}{3}$and $\tfrac{3}{5}$respectively. Find the probability that at least one of them will live up to 80 years

The probability that a student passes a physics test$\frac{2}{3}$. If he takes three physics test, what is the probability that he passes two of the tests?

In how many ways can the letters of the word **TOTALITY** be arranged?

Evaluate $^{n+1}{{C}_{n-2}}$ if *n* = 15

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The grades of 36 students in a class test are as shown in the pie chart above. How many students have excellent?