solve it Q7 plz quickly
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Here a = 7
d = 10.5-7= 3.5
N= 23
NOW
S= N/2 (2a+(n-1)d)
= 23/2(2*7+(23-1)*3.5)
=11.5*(14+77.0)
=11.5 *91
= 1046.5
d = 10.5-7= 3.5
N= 23
NOW
S= N/2 (2a+(n-1)d)
= 23/2(2*7+(23-1)*3.5)
=11.5*(14+77.0)
=11.5 *91
= 1046.5
Answered by
0
use Sn=n(2a+(n-1)d)/2
as n =23 a=7 d=3.5
which gives Sn=1046.5
as n =23 a=7 d=3.5
which gives Sn=1046.5
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