the 12th term of ap is -13 and sum of its first 4 terms is 24 find sum of first 10 terms
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Step-by-step explanation:
12th term=-13, this implies a+11d=-13...(i)
sum of first 4 terms=24, this implies (4/2)(2a+3d)=24
which is equal to 2a+3d=12...(ii)
Solving equation(i) and (ii)
a=9&d=-2
hence using the sum formula
the sum of first 10 terms=(10/2)(2×9+9×(-2))=5(18-18)=0
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