GRE Exam Numerical Ability Permutation and Combination

ek admi ka 4 ladki dost hai aur 3 ladka dost..ab uski biwi ke 4 ladka dost hai aur 3 ladki dost..ab
hai na ek party ke liye dono invite karta h 6 banda ko..ab usme se admi ke 3 dost hone chahiye
kamsekam aur biwi ke bhi 3 dost hone chahiye kamsekam..usme se 3 ladka hona chahiye aur 3
ladki..nikalo beta combination frnd ka??

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GRE Other Question
After preparing the results of their measurement of the weight of children that participated in their pediatric study, Steph's graduate assistant spilled coffee on their papers. If Steph is able to read that 50 lbs is the third standard deviation to the left of the mean, and 110 lbs also falls on a standard deviation, then which of the following could be the mean weight of the children in the study, assuming regular distribution? Indicate all possible values.
a. 80
b. 85
c. 86
d. 95
e. 100 summation from i=0 to 6409 of ai=? where:
ai= 29(if ai is divided by 13 & 17)
ai= 17(if ai is divided by 13 & 29)
ai= 13(if ai is divided by 17 & 29)
ai=0(else)