Question

what is the sum of all numbers between 100 and 1000 which are divisble by 23?​

Answer 1

$\huge{\mathfrak{Answer:-}}$

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The series is

115 , 138 ........ 989

Number of terms = 43 - 5 = 38

To find the sum,

$s = \frac{n}{2} (a + l)$

=> 38/2 ( 115 + 989 )

=> 19 × 1104

=> 20,976

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