Find the sum of all three digits number which are divisible by 7 by Ar

1.	Find the sum of all three digits number which are divisible by 7 by Arithmetic Progression class 10
Answer» 105,112,119,......994 last term = 994 => a + (N-1)d = 994 => 105 + (n-1)7 = 994 => (n-1)7 = 889 => n - 1 = 127 => n = 128 $Sn = \frac{128}{2} (105 + 994) \\ \\ = 64 \times 1099 \\ \\ = 70336$

Find the sum of all three digits number which are divisible by 7 by Arithmetic Progression class 10

Answer»

105,112,119,......994

last term = 994

=> a + (N-1)d = 994

=> 105 + (n-1)7 = 994

=> (n-1)7 = 889

=> n - 1 = 127

=> n = 128

$Sn = \frac{128}{2} (105 + 994) \\ \\ = 64 \times 1099 \\ \\ = 70336$

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Find the sum of all three digits number which are divisible by 7 by Arithmetic Progression class 10​

105,112,119,......994

last term = 994

=> a + (N-1)d = 994

=> 105 + (n-1)7 = 994

=> (n-1)7 = 889

=> n - 1 = 127

=> n = 128

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Find the sum of all three digits number which are divisible by 7 by Arithmetic Progression class 10