Anna is participating in a trivia game with 6 questions, each with 3 choices. Only one choice is correct per question. If Anna guesses on all questions, what is the probability that she gets exactly 3 correct?
ATQ, Probability of a correct guess = 1/3 Probability of an incorrect guess = 2/3 Number of ways to choose 3 correct answers out of 6 = (6/3) = 20 So, the required probability = 20 × (1/3)3 × (2/3)3 = (20×1×8)/(27×27) = 160/729
If we arrange all the letters of the word SCRAPBOOK in the alphabetical order from the left end, then the position of how many letter(s) will remain u...
If all the digits of the number 9637866458 are arranged in decreasing order, then sum of 5th and 6th digits (from the left end) o...
If third letter from the left end of each word from each group is to be considered, then which among the following group of words can make at least one ...
If all the letters of the word ‘SKETCHING’ are arranged in the alphabetical order starting from the left end then how many consonants appear at the ...
If in the number “632642347”, “1” is subtracted from all the odd digits and “2” is added to all the even digits, then which of the following...
How many such pairs of letters are there in the words ‘COMPLIMENTS’ each of which has as many letters between them in words (both in backwar...
How many such pairs of digits are there in the number “ 257683914”, each of which has as many digits between them in the number both forward and bac...
If all the prime digits of the number 8695878795 are written first (in increasing order) followed by even digits(in increasing order) and then odd digit...
If in the number “756852733846321876”, the number at each odd position is decreased by 1, then how many such numbers are there in the final arrange...
Which of the following elements should come in a place of ‘?’
NO4 PM6 RK8 ?
...
