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Q.

If the 10th  term of an A.P. is 120 and its 20th  term is 110 , then the sum of its first 200 terms is

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a

50

b

100

c

10012

d

5014

answer is C.

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Detailed Solution

T10=120=a+9d ……..(i)T20=110=a+19d ………..(ii)⇒ a=1200,d=1200 ⇒ S200=20022200+199200=2012=10012
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If the 10th  term of an A.P. is 120 and its 20th  term is 110 , then the sum of its first 200 terms is