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use formula :
s= a/(1-r)
with a=first term
r=ratio=u2/u1=u3/u2

huh?

ok, a=1 and r=(-1/3)/1 = -1/3
plug in a=1 and r=-1/3 to that formula!

soooo its 3/4??

yup

sorry i did a mistake in the formula it will be a/(1-r)

do u do it the same way when the question is 4/3+2/3+1/3...

yea, that's right.

yes here the ratio(r) is 1/2 ..

k thx

oke, what's answer do u get ?