Hi Praveen,
You would expect that the routers would send 1 hello, receive 1 hello and then exchange routing information but it’s not the way it works with EIGRP. Once an EIGRP-enabled router receives a hello packet, it will send an update packet. A good way to see this in action is to configure EIGRP on two routers and then use an inbound access-list on one router that filters traffic destined for 224.0.0.10. If you do this, one router will filter all hello packets and you’ll see that its neighbor will still send update packets.
Forming the neighborship doesn’t really have anything to do with split horizon, I just mentioned it but could get rid of it in this example.
Rene