Question

How to find the sum of all the multiples of 3 or 5 below 10 in Python

Answer 1

sum = 0
i = 3

while (i < 10) :
    if (i % 3 == 0 or i % 5 == 0) :
        print(i)
        sum += i
    i += 1
    
print("sum = " + str(sum))




'''
run:

3
5
6
9
sum = 23

'''

 

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Answer 2

sum = 0

for i in range(3,10):
    if (i % 3 == 0 or i % 5 == 0) :
        print(i)
        sum += i
    i += 1
    
print("sum = " + str(sum))




'''
run:

3
5
6
9
sum = 23

'''

 

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Answer 3

def Summ( n) :
    return int((n * (n + 1)) / 2)
         
below10 = 9
sum = 3 * Summ((int(below10 / 3))) + 5 * Summ((int(below10 / 5))) - (3 * 5) * Summ((int(below10 / 15)))
 
print("sum = " + str(sum))
 
 
 
 
'''
run:
 
sum = 23
 
'''

 

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