in ap first term is 8 and nth term is 33and sum of first n term is 123 then find the value of n
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hope this helps...........
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bhumibhardwaj:
but how can we write a+an in formula
okk okk i undrstnd
thnc
Answered by
1
As we know,
Here,
A=8
An=33
An=123
N=? (To be calculated)
So,
Sn=n/2(a+an)
123=n/2(8+33)
123*2=n*41
123*2/41=n
3*2=n
Hence no. Of terms =6
Here,
A=8
An=33
An=123
N=? (To be calculated)
So,
Sn=n/2(a+an)
123=n/2(8+33)
123*2=n*41
123*2/41=n
3*2=n
Hence no. Of terms =6
hm
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