Questions
If 7th term of an A.P. is 9 and 9th term of the A.P. is 7, then 20th term of the A.P. is
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a
-2
b
-3
c
-4
d
-6
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Correct option is C
If d is common difference of the A.P., then 2d=a9−a7=7−9=−2⇒ d=−1.∴ a20=a9+(20−9)d=7−11=−4Similar Questions
If and 1 are in A.P, then x is equal to
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