AP EAMCET · Maths · Permutation Combination
The number of all 8 digit odd numbers is
- A \(45 \times 10^6\)
- B \(90 \times 10^6\)
- C \(9 \times 10^8\)
- D \(9 \times 10^6\)
Answer & Solution
Correct Answer
(A) \(45 \times 10^6\)
Step-by-step Solution
Detailed explanation
For this, we must ensure that the last digit (8th digit) is odd, which means it can only be \(1,3,7,5\) or 9 and first digit can't be zero. \(\therefore\) The total no. of 8-digit odd numbers. \(=(\) Choices for first digit \() \times(\) Choices for the remaining 6 digits)…
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
- If \(x=\sin \left(2 \tan ^{-1} 2\right)\) and \(y=\sin \left(\frac{1}{2} \tan ^{-1} \frac{4}{3}\right)\),thenAP EAMCET 2016 Hard
- \(\begin{aligned} & \frac{x^2+1}{x^4+4}=\frac{A x+B}{x^2-2 x+2}+\frac{C x+D}{x^2+2 x+2} \\ & \Rightarrow 3 A+2 B+3 C=\end{aligned}\)AP EAMCET 2022 Medium
- If \(y=x-x^2\), then the rate of change of \(y^2\) with respect to \(x^2\) at \(x=2\) isAP EAMCET 2024 Easy
- If a real valued function \(f:[-1,2] \rightarrow B\) defined by
\(f(x)=\left\{\begin{array}{l}
1-x, \quad \text { when }-1 \leq x \leq 1 \\
x-1, \quad \text { when } 1 < x \leq 2
\end{array}\right.\)
is a surjection, then \(\mathrm{B}=\)AP EAMCET 2025 Medium - \(\int \frac{x+1}{\sqrt{x^2+x+1}} d x=\)AP EAMCET 2024 Medium
- If \(y=\tan ^{-1}\left(\frac{a \cos x-b \sin x}{b \cos x+a \sin x}\right)\), then \(\frac{d y}{d x}\) is
equal toAP EAMCET 2021 Medium
More PYQs from AP EAMCET
- A bullet of mass \(20 \mathrm{~g}\) moving with \(500 \mathrm{~ms}^{-1}\) is pierced \(1 \mathrm{~cm}\) into a wooden block, then the retarding force experienced by the bullet isAP EAMCET 2023 Medium
- A man of \(50 \mathrm{~kg}\) is standing at one end on a boat of length \(25 \mathrm{~m}\) and mass \(200 \mathrm{~kg}\). If he starts running and when he reaches the other end, he has a velocity \(2 \mathrm{~ms}^{-1}\) with respect to the boat. The final velocity of the boat is : (in \(\mathrm{ms}^{-1}\) )AP EAMCET 2006 Easy
- The following effect is known as___
AP EAMCET 2021 Easy - Identify \(B\) in the following reaction
\(\mathrm{H}_4 \mathrm{SiO}_4 \underset{-\mathrm{H}_2 \mathrm{O}}{\stackrel{1000{ }^{\circ} \mathrm{C}}{\longrightarrow}} A \underset{\Delta}{\stackrel{\text { Carbon }}{\longrightarrow}} B+\mathrm{CO}\)AP EAMCET 2008 Hard - If \(a x^2+6 x y+b y^2-10 x+10 y-6=0\) represents a pair of perpendicular lines, then the values of \(|a|\) equalsAP EAMCET 2021 Easy
- Two waves of frequency \(f\) and amplitude \(a\) superimpose with each other. The total intensity is directly proportional toAP EAMCET 2020 Easy