Question

Q.11 Solve the equation + 1 =
+ 1 = 2 + 3
7x
15
and 3
Q.12 a)What is the probability of getting a non-red ball from a bag containing 4 red, 5 blue
black balls?
b) Ankita and Nagma are friends. They were both born in 1998. What is the probability that they
have same birthday?
C)What is the Probability of selecting a consonant from the letters of the word 'FATHER'.​

Answer 1

Answer:

Total number of possible three numbers=20

C

3

=1140

a,b,c are in AP

2b=a+c=even

Therefore a,c are either both even or both odd

There are 10 odd and 10 even numbers in 1..20

Favourable case=10

C

2

+10

C

2

=90

Probability=90/1140=3/3