how many terms of AP -6, -11/2, -5, .. will give sum -25
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Ap is -6,-11/2....
a= -6
d= 1/2
n=?
an -25
As by formula
an = a+(n-1)d
-25= -6+(n-1)1/2
Now solve this u will get
N=-37
a= -6
d= 1/2
n=?
an -25
As by formula
an = a+(n-1)d
-25= -6+(n-1)1/2
Now solve this u will get
N=-37
shweta4760:
thank you, i don't know why this didn't came to mind. U solved so easily
but its sn not an
Oh sorry
Sn = n/2 (2a+(n-1)d) now apply this formula
ok
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