5+10+15 + ... +100, Find the sum of the given equation.
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a = 5
d = 5
L = 100
=> a + (n-1)d = 100
=> 5 + (n-1)(5) = 100
=> ( n-1) (5) = 95
=> n - 1 = 19
=> n = 20
Required sum = n/2 ( a + L)
= 20 /2 ( 5 + 100)
= 10 × 105
= 1050
d = 5
L = 100
=> a + (n-1)d = 100
=> 5 + (n-1)(5) = 100
=> ( n-1) (5) = 95
=> n - 1 = 19
=> n = 20
Required sum = n/2 ( a + L)
= 20 /2 ( 5 + 100)
= 10 × 105
= 1050
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