Ques 181 : Choose the correct answer.

An unbiased coin is tossed n times. If the probability of getting 4 tails equals the probability of getting 7 tails, then the probability of getting two tails is:

**Option 1 : 55/2048**

Option 2 : 3/4096

Option 3 : 1/1024

Option 4 : None of these

Ques 182 : Choose the correct answer.

Sudhanshu and Pankaj stand in a circle with 10 other persons. If the arrangement of the person is at random, then the probability that there are exactly 3 persons between Sudhanshu and Pankaj is?

Option 1 : 9/11

**Option 2 : 2/11**

Option 3 : 1/11

Option 4 : None of these

Ques 183 : Choose the correct answer.

Three numbers are chosen from 1 to 30 randomly. The probability that they are not consecutive is:

Option 1 : 1/145

**Option 2 : 144/145**

Option 3 : 139/140

Option 4 : 1/140

Ques 184 : Choose the correct answer.

A bag is full of 20 bananas and no other fruit. Rajeev draws a fruit from the bag. What is the probability that he will draw a banana?

Option 1 : 1

Option 2 : 0

**Option 3 : 1/2**

Option 4 : None of these

Ques 185 : Choose the correct answer.

An unbiased dice is rolled 5 times and the outcomes are 1, 2, 3, 4 and 5 respectively. If it is rolled again, what is the probability that the outcome is 6?

Option 1 : 1

Option 2 : 5/6

**Option 3 : 1/6**

Option 4 : None of these

Ques 186 : Choose the correct answer.

The probability of drawing an apple from a bag of fruits is 6/25. How many apples should Ravi draw, so that there is a chance he will draw 12 apples on average?

Option 1 : 25

**Option 2 : 50**

Option 3 : 12

Option 4 : None of these

Ques 187 : Choose the correct answer.

What is the probability for a day to be Sunday?

**Option 1 : 1/7**

Option 2 : 1/5

Option 3 : 52/365

Option 4 : None of these

Ques 188 : Choose the correct answer.

Rani has a bag with three blue and three yellow coins. She takes out a coin, sees its colour and puts it back in the bag. She does this thrice. What is the probability that she saw all blue coins.

**Option 1 : 1/8**

Option 2 : 1/2

Option 3 : 1/3

Option 4 : None of these

Ques 189 : Choose the correct answer.

Shikhar has a bag with 2 balls, each of which can be black or white with equal probability. Now, he draws out a ball and it turns out to be black. After this event, what is the probability that both balls are black?

**Option 1 : 1/2**

Option 2 : 1/4

Option 3 : 1

Option 4 : None of these

Ques 190 : Choose the correct answer.

A coin is tossed thrice. What is the probability that the first toss of coin lands head, second tail and third lands tail as well?

Option 1 : 1/16

Option 2 : 3/8

**Option 3 : 1/8**

Option 4 : None of these