diff --git a/combinations.rb b/combinations.rb
new file mode 100644
index 0000000..1c68936
--- /dev/null
+++ b/combinations.rb
@@ -0,0 +1,13 @@
+def combinations(array1, array2)
+	answer = []
+	array1.each do |word1|
+		array2 do |word2|
+			mix = word1 + word2
+			answer << mix
+		end
+	end
+	return answer
+end
+
+
+p combinations(["on", "in"], ["to", "rope"])
\ No newline at end of file
diff --git a/factorial.rb b/factorial.rb
new file mode 100644
index 0000000..9ff85b5
--- /dev/null
+++ b/factorial.rb
@@ -0,0 +1,7 @@
+def factorial (integer)
+	answer = 1
+	(1..integer).each { |num| answer *= num }
+	return answer
+end
+
+puts factorial (5)
\ No newline at end of file
diff --git a/overlap.rb b/overlap.rb
new file mode 100644
index 0000000..851760b
--- /dev/null
+++ b/overlap.rb
@@ -0,0 +1,6 @@
+def overlap(rectangle1, rectangle2)
+  rectangle1[0][0] < rectangle2[1][0] && rectangle1[1][1] > rectangle2[0][1] && rectangle1[1][0] > rectangle2[0][0] && rectangle1[0][1] < rectangle2[1][1]
+end
+
+puts overlap( [ [0,0],[3,3] ], [ [1,1],[4,5] ] )
+puts overlap( [ [0,0],[1,4] ], [ [1,1],[3,2] ] )
\ No newline at end of file
diff --git a/power.rb b/power.rb
new file mode 100644
index 0000000..3185c5d
--- /dev/null
+++ b/power.rb
@@ -0,0 +1,7 @@
+def power (base, exponent)
+	answer = 1
+	exponent.times {answer *= base}
+	return answer
+end
+
+puts power (3,4)
\ No newline at end of file
diff --git a/primes.rb b/primes.rb
new file mode 100644
index 0000000..dc12fad
--- /dev/null
+++ b/primes.rb
@@ -0,0 +1,10 @@
+def is_prime?(integer)
+	return false if integer == 1
+	max = Math.sqrt(integer)
+	(2..max).all? { |x| integer % x != 0 }
+end
+
+is_prime?(7)      
+is_prime?(14)
+
+
diff --git a/uniques.rb b/uniques.rb
new file mode 100644
index 0000000..e1ab62f
--- /dev/null
+++ b/uniques.rb
@@ -0,0 +1,9 @@
+def uniques(array)
+	answer = []
+	array.each do |object|
+		answer << object unless answer.include?(object)
+	end
+	return answer
+end
+
+p uniques([1,5,"frog", 2,1,3,"frog"])
\ No newline at end of file