Download App

Permutations — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsPermutations3 Marks
Question
A customer forgets a four-digits code for an Automatic Teller Machine (ATM) in a bank. However, he remembers that this code consists of digits 3, 5, 6 and 9. Find the largest possible number of trials necessary to obtain the correct code.
✓

Answer

Total number of digits = 4.
$\therefore$ The largest possible number of trials to obtain the correct code = 4 × 3 × 2 × 1
= 24 [$\because$ digits are not repeated]

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Permutations→Permutations — all question types→Maths STD 11 Science question papers→CBSE Board STD 11 Science question papers→CBSE Board question paper generator→

Similar questions

Out of $25$ members in a family, $12$ like to take tea, $15$ like to take coffee and $7$ like to take coffee and tea both. How many like
$i.$ at least one of the two drinks
$ii.$ only tea but not coffee
$iii.$ only coffee but not tea
$iv.$ neither tea nor coffee
→
Prove that:
$\cos4\text{x}-\cos4\alpha=8(\cos\text{x}-\cos\alpha)(\cos\text{x}+\cos\alpha)\$\cos\text{x}+\sin\alpha)(\cos\text{x}-\sin\alpha)$
→
How many different numbers of six digits each can be formed from the digits 4, 5, 6, 7, 8, 9 when repetition of digits is not allowed?
→
Calculate the mean, variance and standard deviation for the following distribution:
Class 30-40 40-50 50-60 60-70 70-80 80-90 90-100
Frequency 3 7 12 15 8 3 2
→
Find the equation of the right bisector of the line segment joining the points A(1, 0) and B(2, 3).
→
Out of 500 car owners investigated, 400 owned Maruti car and 200 owned Hyundai car, 50 owned both cars. Is this data correct?
→
$\text{b}\sin\text{B}-\text{c}\sin\text{C = a}\sin(\text{B}-\text{C})$
→
Find the equation of the circle which circumscribes the triangle formed by the lines
$x + y + 3 = 0, x - y + 1 = 0$ and $x = 3$
→
Out of $100$ students, two sections of $40$ and $60$ are formed. If you and your friend are among the $100$ students, what is the probability that,
  1. you both enter the same section?
  2. you both enter the different sections?
→
If the sum of three numbers in A.P., is $24$ and their product is $440$. Find the numbers.
→