Sum of all the number divided by 7 between 100 and 9000
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Numbers divisible by 7 between 100 and 9000
105, 112,...........,8995
a = 105
an = 8995
d = 7
an = a + (n - 1)d
8995 = 105 + (n - 1)7
8890 = (n - 1)7
n - 1 = 8890/7
n - 1 = 1270
n = 1271
Sn = n/2 [a + an]
Sn = 1271/2[105 + 8995]
Sn = 1271/2*[9100]
Sn = 1271 * 4550
Sn = 57,83,050 ——> Answer
105, 112,...........,8995
a = 105
an = 8995
d = 7
an = a + (n - 1)d
8995 = 105 + (n - 1)7
8890 = (n - 1)7
n - 1 = 8890/7
n - 1 = 1270
n = 1271
Sn = n/2 [a + an]
Sn = 1271/2[105 + 8995]
Sn = 1271/2*[9100]
Sn = 1271 * 4550
Sn = 57,83,050 ——> Answer
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