Question

The 12th term of Asthmatic progmassion x+y, x-y, x-3y answer​

Answer 1

Answer:

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Answer 2

Answer:

Let a be the first term and d be the common difference of the A.P.

a=(x+y) and d=(x−y)−(x+y)=−2y.

S

20

=

2

20

×[2a+(20−1)d]=10×[2(x+y)+19×(−2y)]=20(x−18y).