Find two composite numbers between 50 & 90 such that one of the number is a square number and the difference between the numbers is which multiple of 9?
Answers
Answer:
Answer
i) Number of two-digit number =90−9=81, Total number =90
Probability of being a two-digit number =
90
81
ii) Since there are 9 perfect square numbers such that 1,4,9,16,25,36,49,64,81
Probability of being a perfect square =
90
9
=
10
1
iii) Since there are 12 numbers divisible of 7 such that 7,14,21,28,35,42,49,56,63,70,77,84
Probability of being a perfect square =
90
12
=
15
2
.
Step-by-step explanation:
i) Number of two-digit number =90−9=81, Total number =90
Probability of being a two-digit number =
90
81
ii) Since there are 9 perfect square numbers such that 1,4,9,16,25,36,49,64,81
Probability of being a perfect square =
90
9
=
10
1
iii) Since there are 12 numbers divisible of 7 such that 7,14,21,28,35,42,49,56,63,70,77,84
Probability of being a perfect square =
90
12
=
15
2
.