by shivamtripathi22 | Mar 14, 2022 | Uncategorized
(Q). In the annual function of a school 10 boys & 20 girls danced such that in a particular dance only 1 boy & 1 girl participated. Total how many dance was performed?Solution:- In a dance we have to select one boy out of 10 boys in ¹⁰C₁ = 10 ways, and one...
by shivamtripathi22 | Mar 14, 2022 | Uncategorized
(Q). In an examination a student has to write 8 papers & has to pass in each paper to pass the exam. In how many ways a student can fail in the exam?Solution:- For every paper there are 2 ways of selection → Pass or Fail.So total number of ways is 2⁸ = 256 &...
by shivamtripathi22 | Mar 14, 2022 | Uncategorized
(Q). In class (V) there are three sections A, B & C with number of students 50, 70 and 90 respectively while in class (vi) there are three sections A, B & C with number of students 70, 90 & 50 respectively. In how many ways 15 students can be selected...
by shivamtripathi22 | Mar 14, 2022 | Uncategorized
(Q). In how many ways 8 distinct alphabets can be selected so that no vowel is selected?Solution:- total alphabets = 26 vowels = 5 consonants = 26 – 5 = 21 so we have to select 8 consonants out of 21 consonants & this can be done...
by shivamtripathi22 | Mar 14, 2022 | Uncategorized
(Q). In how many ways 11 players can be selected out of 25 players if Ram & Shyam are always selected and Mohit & Ankit are always rejected...
