ExamBro
ExamBro
enEnglishhiहिन्दीguગુજરાતી
JEE Mains · Maths · STD 12 - 1. relation and function

ધારો કે વિધેય \(f: R \rightarrow R\) માટે \(f(x+y)=f(x) f(y)\) બધા \(x, y \in R\) અને \(f(1)=3\) થાય જો \(\sum \limits_{i=1}^{n} f(i)=363,\) હોય તો \(n\) ની કિમત શોધો 

  1. A \(6\)
  2. B \(5\)
  3. C \(7\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(5\)

Step-by-step Solution

Detailed explanation

\(f(x+y)=f(x) f(y)\) put \(x = y =1 \quad f(2)=(f(1))^{2}=3^{2}\) put \(x=2, y=1 \quad f(3)=(f(1))^{3}=3^{3}\) : Similarly \(f(x)=3^{x}\) \(\sum_{i=1}^{n} f(i)=363 \Rightarrow \sum_{i=1}^{n} 3^{i}=363\) \(\left(3+3^{2}+\ldots+3^{n}\right)=363\)…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app