Question: 
Write a python function to find the sum of all odd natural numbers within the range l and r.


Model's Code:
def sum_in_Range(l, r):
    return sum(i for i in range(l, r + 1) if i % 2 != 0)



Sample Correct Code:
def sum_Odd(n): 
    terms = (n + 1)//2
    sum1 = terms * terms 
    return sum1  
def sum_in_Range(l,r): 
    return sum_Odd(r) - sum_Odd(l - 1)


Asserts:
assert sum_in_Range(2,5) == 8
assert sum_in_Range(5,7) == 12
assert sum_in_Range(7,13) == 40


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 797 of 974: 606/797 (76.03513174404016%): success