TS EAMCET · Maths · Functions
If and then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
f1=0 fn+1-fn=5n, ∀n∈N Put n=1 f2-f1=5×1 ⇒f2=5 Put n=2 f3-f2=5×2 ⇒f3=10+5 Put n=3 f4-f3=5×3 f4=15+0+5 Similarly, fn=5+10+15+.....+5n-1 =51+2+.....+n-1 =5nn-12 =52n2-n
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Maths
- In an isosceles triangle the ends of its base are \((2 a, 0)\), \((0, a)\) and one of its two other sides is a horizontal line other \(\mathrm{X}\)-axis. If the third vertex is \(\left(x_1, y_1\right)\) then \(x_1+y_1=\)TS EAMCET 2022 Easy
- \(\lim _{n \rightarrow \infty}\left[\left(1+\frac{1}{n^2}\right)\left(1+\frac{2^2}{n^2}\right) \ldots(2)\right]^{\frac{1}{n}}=\)TS EAMCET 2023 Medium
- If \(x \sqrt{1+y}+y \sqrt{1+x}=0\), then \(\frac{d y}{d x}\) is equal toTS EAMCET 2005 Medium
- If \(2+\sqrt{3}\) is a root of the equation \(f(x)=x^4+2 x^3-16 x^2-22 x+7=0\), then which one of the following is not a root of \(f(x)=0 ?\)TS EAMCET 2020 Easy
- The position vector of a point \(P\) is \(2 \hat{\mathbf{i}}+\hat{\mathbf{j}}+3 \hat{\mathbf{k}}\) and \(\mathbf{a}=-\hat{\mathbf{i}}-2 \hat{\mathbf{k}}, \mathbf{b}=\hat{\mathbf{i}}+\hat{\mathbf{j}}+2 \hat{\mathbf{k}}\) are two vectors which determine a plane \(\pi\). The equation of a line through \(P\) normal to \(\mathbf{b}\) and lying on the plane \(\pi\) isTS EAMCET 2020 Easy
- If are the points of contact of the tangents drawn from the point to the circle and the chord subtends an angle at thenTS EAMCET 2022 Medium
More PYQs from TS EAMCET
- A wooden cube of side 10 cm floats at the interface between water and oil with its lower surface 3 cm below the interface. If the density of oil is \(0.9 \mathrm{~g} \mathrm{~cm}^{-3}\), the mass of the wooden cube isTS EAMCET 2024 Hard
- The area enclosed (in square units) by the curve , the -axis and the vertical lines passing through the two minimum points of the curve isTS EAMCET 2018 Hard
- \(A\) and \(B\) are ideal gases. The molecular weights of \(A\) and \(B\) are in the ratio of \(1: 4\). The pressure of a gas mixture containing equal weights of \(A\) and \(B\) is \(P\) atm. What is the partial pressure (in atm) of \(B\) in the mixture?TS EAMCET 2005 Easy
- TS EAMCET 2022 Easy
- For a first order reaction at \(27^{\circ} \mathrm{C}\), the ratio of time required for \(75 \%\) completion to \(25 \%\) completion of reaction isTS EAMCET 2009 Easy
- The acute angle between the two lines whose direction ratios are given by \(l+m-n=0\) and \(l^2+m^2-n^2=0\), isTS EAMCET 2002 Easy