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481.

On her vacations, Veena visits four cities (A, B, C and D) in a random order. What is the probability that she visits:

(i) A before B? (ii) A before B and B before C?

(iii) A first and B last? (iv) A either first or second (v) A just before B?

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482.

In a relay race, there are five teams, A, B, C, D and E.

What is the porbability

(i) that A, B, C finish first, second and third respectively?

(ii) that A, B and C are first three to finish (in any order)?

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483. Letters of the word ‘SHARP’ are arranged. What is the probability that a randomly chosen word begins with A and ends with R?

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484. Letters of the word ‘DELAYS’ are arranged. Find the probability that D and S are at the end places of the new word.

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485. 5 girls are arranged in a row. Find the probability that the youngest and the eldest are always together.

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486.

Letters of the word ‘EDUCATION’ are re-arranged. Find the probability that the vowels are always together.

Also, find the probability that the vowels are not all together.

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Solution not provided.
Ans. (i) No: P(A)>1 (ii) Yes (iii) Yes
(iv) No: P(A)<0 (v) Yes (vi) No: P(A) < 0

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488. The probability that Mrs Shah will get a job in the bank is ³/₇. What is the probability that she will not get the job?

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489. The probability that the hunter will miss the target is ²/₃ . What is the probability that he will hit the target?

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490. One coin is tossed, find the probability of getting (i) a tail (ii) no tail.

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