find the 1st term of an ap having 9 terms whose last term is 28 and the sum of all terms is 144
Answers
Answered by
4
use the formula
Sn=n/2(a+l)
where
Sn=144
l=28
n=9
Sn=n/2(a+l)
where
Sn=144
l=28
n=9
Answered by
2
formula is---S= n/2(a+l),a=1st term ,n= no. of terms,l=last term,s=sum
here,n=9,l=28,s=144...on solving,we get a=4...
hence,1st term=4
here,n=9,l=28,s=144...on solving,we get a=4...
hence,1st term=4
Similar questions