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The sum of first 24 terms of the A.P, if it is known that
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a
700
b
800
c
900
d
600
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Correct option is C
We known that in an A.P the sum of the termsequidistant from the beginning and end is always same and is equal tothe sum of first and last term, ie. a1+an=a2+an−1=a3+an−2=.....So if an A.P. consists of 24 terms, then a1+a24=a3+a20=a10+a15a1+a5+a10+a15+a20+a24=225⇒a1+a24=2253=75∴S24=242a1+a24usingSn=n2a1+an=12(75)=900( using (i))Similar Questions
If and 1 are in A.P, then x is equal to
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