the sum of first 17term of ap 289 and sum of first 23term is 529
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a+16d=289
a+22d=529
let us take this as eq 1 and 2
from 1 and 2 by elimination method
+a+16d=289
-a-22d=529
That gives
-6d=-240
d=-240/-6
d=40
a+22d=529
let us take this as eq 1 and 2
from 1 and 2 by elimination method
+a+16d=289
-a-22d=529
That gives
-6d=-240
d=-240/-6
d=40
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