Which is perfect number?

Perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Ot...

What is BIS on BlackBerry?

Updated December 02, 2019. BlackBerryInternetService (BIS) is an email and synchronizationserviceprovided by RIM for BlackBerry users. It was createdforB...

When did space war come out?

1978 . Keeping this in view, who created space war? Steve Russell Martin Graetz Peter Samson Wayne Witaenem Similarly, when did computer space come out? ...