Elitmus Exam Numerical Ability Permutation and Combination

let Q be 1 to 9 digit number without repeating which is divisible by 11.and Qe be the substring of Q then Qe is divisible by 11 what is difference of sum of alternatives in Qe
i)o ii)11 iii)22 iv)33

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Elitmus Other Question

N be a number,the 2,3 and 5 base notations u get last digit is 1.and two out of three the leading digit is 1. N is equal to
A)31 b)63 c)74 d)91
If a>b>c>d>e>0 and the avg of a & e is 7 and b & d is 4.5.How many possible combination will satisfy the above condition?
i think question was smthing like that came in 22 nov elitmus ph test....