Elitmus Exam Numerical Ability Log and Antilog

K=log base 3n,n <1000 n and k are whole no. How many value of k and n are possible.
A.5
B.6
C.7
D.none of these

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Elitmus Other Question

Find the value of x?
{15,7,11,23,19,x}
1)the sequence are in arithmetic progression.
2)x is prime number
sum of two no is 100 and sum of their reciprocal is 4/51 , if the smallest no is L then which of the following is true , ( i forgot the options)