Sequences and Series 4 Question 7

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

(2004, 1M)

(a) x<10

(b) 10<x<0 (c) 0<x<10

(d) x>10

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Solution:

  1. We know that, the sum of infinite terms of GP is

S=a1r,|r|<1S=x1r=5[|r|<1] or 1r=x5r=5x5 exists only when |r|<1 i.e. 1<5x5<1 or 10<x<00<x<10



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