Elitmus Exam Numerical Ability Permutation and Combination

A lady gives a dinner party to six quests. The number of ways in which they may be selected from
among ten friends, if two of the friends will not attend the party together is (a) 112 (b) 140
(c) 164 (d) None of these

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Elitmus Other Question

My percentile was
Verbal 31
Problem Solving 83
Quant 84

I am an M.tech student.Can i expect call from any companies(like accenture)?
If the product of n positive numbers in 1, then their sum is
(a) a positive integer (b) divisible by n
(c) equal to 1 n n + (d) never less than n