General Maths Puzzle Numerical Ability Geometry

(xn+yn) is divisible by (x-y)
if n is:
a) Even integer
b) Odd integer
c) For all integers
d) Not possible for any real values

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General Other Question

. Anil and Jagjeet want to go from Coimbatore to Ooty. There are two ways to do this. First way is to hire a two wheeler, second is to go by bus. Jagjeet started immediately to Ooty in a non stop bus. After sometime Anil hired a Yamaha bike and started towards Ooty. Anil overtook Jagjeet at 10.00 a.m. Anil reached Ooty at 12.30 p.m. and spent an hour. While returning from Ooty, he met the bus at 2.00 p.m. When will the bus reach Ooty?
2.30 p.m.
3.00 p.m.
3.30 p.m.
4.00 p.m.
3 pipes A,B,C can fill a tank in 60 min, 30 min, and 15 min respectively.
If all open the same time how long it takes to fill the tank.

Thanks