if a=_4 , an=29 , sn=150,d=?
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a= - 4, an=29, Sn =150
Sn = n/2[a+an] =150
n/2[ - 4+29] = 150
25n = 300
n = 12
as we know that
an = a+(n-1)d =29
-4 +(12-1)d = 29
11d = 33
d = 3
i hope it will help u
NeelamG:
number of terms are in whole number
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