Question
A bag contains red, green, and blue balls, with a total
of 16 balls. The probability of drawing two blue balls in one draw is 3/8. How many blue balls are in the bag?Solution
Let number of blue balls in the bag be ‘x’.According to question;xC2/16C2 = 3/8Or, x(x – 1) = 90Or, x2 – x – 90 = 0Or, x2 – 10x + 9x – 90 = 0Or, x(x – 10) + 9(x – 10) = 0Or, (x – 10)(x + 9) = 0Or, x = 10 or x = -9 (not possible)So, number of blue balls in the bag = 10
Four number-pairs are given, three of which are alike in certain manner and one is different. Choose the different number-pair.
The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are f...
Three of the four words are alike in a certain way and one is different. Pick the odd one out.
Three of the four words are alike in a certain way and one is different. Pick the odd one out.
In the following question, four number pairs are given. In each pair the number on left side of ( - ) is related to the number of the right side of ( - ...
In the following question, select the odd word pair from the given alternatives.
In the following question, four number pairs are given. In each pair the number on left side of (-) is related to the number of the right side of (-) w...
Four number-pairs are given, three of them are alike in a certain manner and one is different. Choose the different number-pair.
The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are f...
In the word ‘FRUSTRATED’, first all the letters are written in an alphabetical order form, then remove all the vowels from the arrangement then ho...
Relevant for Exams:
