7+14+21+....+490, find the sum of series
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The given series is an arithmetic progression where
first term (a) = 7
Common difference (d) = 7
last term (l) = 490
Number of terms (n) = 490/7 = 70
Sum of an arithmetic progression = n (a + l)/2
= 70 (7 + 490)/2
= 35*497 = 17395
Therefore sum of the series/A.P is 17,395
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