Question

Sum of two no. is 9 find the probability of the following
(a) composite no.
(b) prime no.
(c) odd or even
(d) multiple of 5
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Answer 1

Answer:

Sum of digits of a two digit number is 9.

So, possible outcomes are 18, 27, 36, 45, 54, 63, 72, 81, 90. Total possible outcomes =9.

(a) Odd numbers are (27, 45, 63, 81) = 4

Probability of a number which is not even =49

(b) Odd composite numbers are (27, 45, 63, 81) = 4

Probability of an odd composite number =49

(c) Numbers divisible by 3 are (18, 27, 36, 45, 54, 63, 72, 81, 90) = 9

Probability of a number divisible by 3 =99=1

Step-by-step explanation:

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