IIT JEE past question AP GP 7

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An infinite GP has first term x and sum 5 then x belongs to

?

#Mathematics #Algebra

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1 Answers

33

Abhishek Priyam ·2009-03-26 06:05:05

x/(1-r)=5

r=1-x/5

-1<r<1 ..râ‰ 0

so 1-x/5<1
x>0

1-x/5>-1
x<10

xâ‰ 5... râ‰ 0

so x belongs to (0,10)-{5}

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