the sum of series in AP is 128 if the first term is 2 & the last term is 14 find the number of terms of the series
Answers
Answered by
1
Answer:
16
Step-by-step explanation:
by formula
sn= n/2{a+l}
sn=128
a=2
l=14
n=16
Answered by
2
Answer:
the sum of series given means
(SN)=128
formula we know
(SN)=n/2(a+an/l)
putting values in formula
128=n/2(2+14)
128x2=16n
128x2/16=n
128/8=n
16=n
where
n= no of terms
a= first term of A.P
L=LAST TERM OF A.P
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