mod and series
mod and series

MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank,MrinmoiHossain/HackerRank