Question

what is probability between 1-90.(i) divisible by 5(ii) 2digit no.

Answer 1

Hello!

Here is your answer!


1. No of terms which is divisible by 5 between 1-90 =18
( 5,10,15,20,25,........90)

Probability : No of outcomes favourable / total no of possible outcomes!

So Answer : 18/90 = 1/5


2 No of terms which are two digits between 1-90 can be calculated with the help of arithematic progression
(10 ,11.12.13..........90)
a = 10
d =1

an = 10 +(n -1)1

90=10+n-1

90-9=n

n = 81

so probability = 81/90=9/10

hope it helps u!!

Answer 2

Hello


Here is your answer!


1 . (5,10,15,20,25,30,.....90) Total 18

Probability = 18/90=1/5


2 (10,11,12,13,14,......90)

Total 81
Probability =81/90=9/10

hope it helps u!!