Trouvez la différence entre deux nombres triangulaires Python
#difference between triangular numbers
num1 = n=9
y=((n**2)+n)/(2)
print (y)
num2 = n=6
y1=((n**2)+n)/(2)
print (y1)
num1 =y
num2 =y1
if num1 > num2:
diff= num1 - num2
else:
diff= num2 - num1
print('The difference between 9th and 6th triangular numbers =',diff)
Travinth Dayalaeaswaran