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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

Asked by sudhanshubhushanroy | 08 Sep, 2017, 11:57: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight Q. space 8.3 space 6 left parenthesis ii right parenthesis space straight P. No. space 439 space

The space names space of space 7 space candidates space can space be space listed space on space the space ballot space paper space by space to the power of 7 straight P subscript 7 space equals 7 factorial
ways.
7 factorial equals 7 cross times 6 cross times 5 cross times 4 cross times 3 cross times 2 cross times 1 equals 5040



NOTE colon

We space appreciate space if space you space solve space remaining space questions space and space show space us space your space work.
We space love space to space guide space you space further.
end style
Answered by Sneha shidid | 08 Sep, 2017, 01:56: PM

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