Find the sum of all odd integers between 10 and 110, which are divisible by 3.
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Sum of all odd integers between 10 and 110, which are divisible by 3 is 960
Solution:
Consider the odd natural numbers between 10 and 110
15, 21, .............. , 105
This forms a arithmetic progression with common difference 6
Therefore, the number of terms:
l = a + (n - 1)d
Where,
l is the last term
a is first term
n is number of terms
d is common difference between terms
Therefore,
l = 105
a = 15
d = 6
Substituting we get,
Therefore, the sum will be:
Thus, sum of all odd integers between 10 and 110, which are divisible by 3 is 960
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