by shivamtripathi22 | Mar 2, 2022 | Uncategorized
(Q). In a certain test, aᵢ students gave wrong answer to at least i question where i = 1, 2, 3, ………, k & no student gave more than k wrong answers. What is the total number of wrong answers?Solution:- Number of students who gave i or more than i...
by shivamtripathi22 | Feb 26, 2022 | Uncategorized
(Q). If r, s, t are prime numbers & p, q are positive integers such that the LCM of p, q is r²t²s⁴, then the number of ordered pair (p,q) is?Solution:-Since r, s, t are prime numbers.∴ selection of p & q will be done in following...
by shivamtripathi22 | Feb 26, 2022 | Uncategorized
(Q). In how many ways 5 numbers can be selected from {1, 2, 3, 4, 5, 6, ………. n} such that not all the five numbers are consecutive?Solution:-Required number of ways= number of ways of selecting 5 out of n students – number of ways of selecting...
by shivamtripathi22 | Feb 26, 2022 | Uncategorized
(Q). In how many ways 5 number can bee selected from {1, 2, 3, 4, 5, 6, ……….n} such that all the five numbers are cosecutive?...
by shivamtripathi22 | Feb 26, 2022 | Uncategorized
(Q). 15 singers were selected to perform in a party, but at a time only 5 singers can perform, then how many times a particular singer performed if no same group of 5 singers performed twice?Solution:- Since a particular singer is always selected then number of ways...
