Where a = first term,r = common ration = number of termsATQ,r20 – 1 = 244(r10 – 1)r20 – 244r10 + 243 = 0r20 – 243r10 – r10 + 243 = 0r10(r10 – 1) – 243(r10 – 1 )= 0⇒ r = √3 (r = 1 is not valid)So, the common ratio is √3

Q. 35.0( 1 Vote )

The sum of the fi

Class 11th

Answer :

Where a = first term,

r = common ratio

n = number of terms

ATQ,

r²⁰ – 1 = 244(r¹⁰ – 1)

r²⁰ – 244r¹⁰ + 243 = 0

r²⁰ – 243r¹⁰ – r¹⁰ + 243 = 0

r¹⁰(r¹⁰ – 1) – 243(r¹⁰ – 1 )= 0

⇒ r = √3 (r = 1 is not valid)

So, the common ratio is √3

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