MBA Exam Numerical Ability Trigonometry

if tan(pi/9) , x, tan(5pi/18) are in AP and tan(pi/9), y, tan(7pi/18) are also in AP then which of the following is true

1) 2x=y
2) x=y
3) x>y
4) x=2y

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MBA Other Question

find the remainder when 432104321043210........upto 3000 digits is divided by 9999.

1) 1407
2) 3333
3) 6666
4) 8592
sum of "n" successive positiv integers x,(x+1),.....{x+(n-1)} is 1000.Then ,wch of d followin is not true about x?(n>1)..elucidate d solution

1) x can be 55
2) x can be 40
3) x can be 198
4) x can be 28