Gate Exam Numerical Ability Permutation and Combination

summation of five digit number made by the help of following number (1,3,5,7,9)repetition not allowed..

Read Solution (Total 2)

how many such no. will be there i.e 5*4*3*2*1=120
ex 13579
15379
this way we have to sum 120 no.
now at unit place we will have all the no. (120/5=24 ) times hence
(1+3+5+7+9)*24=600
hence unit place = 0 carry 60
next 600+60 => tens place =0 and carry 66
next 600+66 +> hundred place =6 carry 66
this way we got 6666600
10 years agoHelpfull: Yes(6) No(0)

sum = 11111*(sum of digits)* 5!/5

= 11111*(1+3+5+7+9)* 24
= 11111* 25* 24
= 6666600
10 years agoHelpfull: Yes(3) No(1)

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p alone would take 8 hours more to complete a job than than both p and q would toghter. if q worked alone, he took 9/2 hrs more than p and q would together. what time they take if and q do it together? The next term in the fallowing series...81,54,36,24__?