7+12+17+22+ ... +102, Find the sum of the given equation.
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a = 7
d = 12 - 7 = 5
L = 102
=> a + (n-1)d = 102
=> 7 + (n-1)(5) = 102
=> (n-1)(5) = 95
=> n - 1 = 19
=> n = 20
Required sum = n/2 (a + L)
= 20 /2 ( 7 + 102)
= 10 × 109
= 1090
d = 12 - 7 = 5
L = 102
=> a + (n-1)d = 102
=> 7 + (n-1)(5) = 102
=> (n-1)(5) = 95
=> n - 1 = 19
=> n = 20
Required sum = n/2 (a + L)
= 20 /2 ( 7 + 102)
= 10 × 109
= 1090
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