Elitmus Exam Numerical Ability Log and Antilog

f(x)=log(base a) X+log(base b)X,given 1

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Elitmus Other Question

T is set of {2,4,8,16,... 2^n} and S is a subset of T...
if two sum of no two elements of s is greater than 2^n-2.

let m be M number of elements in S..
what is the maximum value of M?
If ABC us a three digit number such that no one number is similar to other than how many possible values of ( a + 4b + c ) will be divisible by 40 :
1- 18
2- 16
3- 15
4 - 12