'91' kiwwa kena hari. oka wenne mehemay mchn,
6 : 7 : 8: ? : 56
first three numbers kiyunna deyuk nane , anupiliwelata enne
fourth_number = (first_number + second_number) * second_number
{e.g. fourth_number = (6 + 7) * 7 }
=> 91
fifth_number = second_number * third_number
{e.g. fifth_number...