Question
Cost of 4 pens, 6 note books and 9 files is Rs 305.
Cost of 3 pens, 4 notebooks and 2 files is Rs 145. What is the cost (in Rs) of 5 pens, 8 notebooks and 16 files?Solution
let the cost of pen be 'p',note book be 'n' and of file be 'f' given 4p+6n+9f=305 8p+12n+18f=610 3p+4n+2f=145 Subtracting we get 5p+8n+16f=465
Find total number of ways in which the word “ACCOMMODATE” can be arranged.
In how ways can the selection be made so that a particular member is always included?
How many different nine digit numbers can be formed from the number 66 55 99 222 by rearranging its digits so that the odd digits occupy even positions...
- A school wants to form a committee of 5 students from 6 boys and 4 girls. How many ways can the committee be formed if it must contain at least 3 boys?
How many words can be formed from the word INCREASE in which both E’s do not come together?
In how ways can the selection be made so that a particular member is always excluded?
...How many 4-digit even numbers can be formed using digits 1, 2, 3, 4, 5, 6 without repetition?
How many straight lines can be formed from 9 points out of which 4 are colinear?
From the letters of BALLOON, how many “words” can be formed if all the vowels stay together?
There are 14 candidates for 5 post. In how many different ways can be post be filled?
