Find the sum of following series, x+y, x-y, x-3y,........22 terms
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x+y, x-y, x-3y
The above series is in arithmetic progression
a = x+y
d = -2y
n = 22
sₓ = n/2 [ 2a + (n-1)d ]
sₓ = 11 [ 2x+2y + 11(-2y) ]
sₓ = 11 [ 2x+2y-22y ]
sx = 22x-220y
The above series is in arithmetic progression
a = x+y
d = -2y
n = 22
sₓ = n/2 [ 2a + (n-1)d ]
sₓ = 11 [ 2x+2y + 11(-2y) ]
sₓ = 11 [ 2x+2y-22y ]
sx = 22x-220y
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