in an ap if the 12th term is - 13 and the sum of first four term is 24 .what is sum of first 10 term
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a +11d=-13--1
s4=2 (2a+3d)+24
=2a +3d =12--2
by solving 1 and 2 equation with elenminationethod
a= 9
d=-2
so
S10= 5 (18-18)
=0
s4=2 (2a+3d)+24
=2a +3d =12--2
by solving 1 and 2 equation with elenminationethod
a= 9
d=-2
so
S10= 5 (18-18)
=0
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