CBSE Class 11-science Answered
Q. Ex. 8.2 24 P.No. 427 : Given 6 flags of different colours. How many different signals can be geberated by hoisting the flags on a vertcal pole one below the other each signal requires the use of atleast 4 flags. ans. 1800
Q. 8.3 6(ii) P.No. 439 : Seven candidates are contesting an election . In how many ways can their names be listed on the ballot paper ? ans. 5040
Q. 8.3 (9) P.No. 440 : In how many ways three different rings can be worn in four fingers with atmost one in each finger ? ans. 24
Q. Ex. 8.3 (16) P.No. 440 : How many numbers consisting of five different digits can be made from the digits 14,2,3,9 if (i) the number must be odd , (ii) the first two digits of each number are even ? ans. 8400/2520
Q. Ex. 8.3 - 24(ii) P.No. 441 : Find the number of ways in which 5 boys and 5 girls may be seated in a row so that no two boys are together. ans. 86400