Elitmus Exam Numerical Ability Number System

Sub prime numbers X,Y,Z where, Sub prime num means p+1. p= prime number. X>Y>Z>100. Which would be the closet value of (XYZ) ??
a. XY(Z-1) b,c,d i am not able to remember it right now.

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Elitmus Other Question

100^x (log 4 base x - log root2 base x )..Find Min and max values.
a. 0,infinity b. -infinity, infinity c. infinity,-infinity d.none
6X106 ( X indicate=product hai ) number is given. How many possible numbers are there greater than 6X106 using 00,55,66,999 is given. ( repetition is not allowed )
a.180 b. 720 c. 520 d. (#)
(#) Sign shows that i am not able to remember it right now.