Elitmus
Exam
Category
find the probability when y=x^4+4 is divisible by 5.
a.1/5
b. 2/5
c.1/9
d. 4/5
Read Solution (Total 6)
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- ans will be d.) 4/5
suppose x=0,1,2,3,4,5,6,7,8,9
value of x=10(sample space or possibility)
in which only x=0,5 is not divisible by 5
these two condition is not divisible by 5
so probability of divisible by 5= no of event (divisible by 5)/sample space(total possibility)
p (x)= 8/10
= 4/5 - 10 years agoHelpfull: Yes(18) No(2)
- 2/5
as last digit of x^4 should be either 1 or 6 ( because a no is divisible by 5 if lat digit is 0 or 5)
so the x values should be 1,2,3,4,6,7,8.9
total 5 digit no is 90000 and total no divisible by 5 is about 36000 so
probability=36000/90000=2/5
- 10 years agoHelpfull: Yes(4) No(6)
- it is also given that X is five digit no...then for divisibility of 5 it should be the last digit either 5 or 0,then we to find how many no are there having it unit digit 6 or 1,then 18000 are there having last digit loke this...then probablity=18000/90000=1/5 ans a.
- 10 years agoHelpfull: Yes(0) No(1)
- right answer please...
- 10 years agoHelpfull: Yes(0) No(1)
- 2/5 final ans
- 10 years agoHelpfull: Yes(0) No(1)
- answer : the five digit no. X will be divisible only when it has 5 "or" 0 in the one's position .. and the a five digit no. is possible when the one's position is 0, 1, 2, 3, 4 ,5 ,6 ,7 , 8, 9 ..i.e, in 10 ways ..but for divisibility from 5 there are 5 cases possible when in these digits are in one's position 1=> 1+4=5 , 3=>1+4=5,7=>1+4=5,9=>1+4=5
So, 4/10 = 2/5 Answer - 9 years agoHelpfull: Yes(0) No(0)
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