10. Find out the first term of the ...
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10. Find out the first term of the infinite GP whose first two terms add up to 5, and whose each term is three times in the sum of all terms that follow it. (a) 1 (b) 2 (C) 3 (d) 4.

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( a= ) Ist term ( r= ) common of ho Given ( a+a r=5 ) ( a r^{2}=frac{39 r^{3}}{1-r} ) ( 1-r=3 r ) ( r=frac{1}{4} ) ( a=frac{5}{1+frac{1}{4}}=4 ) So the sener is ( 9,1, frac{1}{9}, frac{1}{16} ) First term = 4 (onton'D)
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