Advertisements
Advertisements
प्रश्न
Find x if `1/(6!) + 1/(7!) = x/(8!)`
Advertisements
उत्तर
Given that `1/(6!) + 1/(7!) = x/(8!)`
`1/(6!) + 1/(7*6!) = x/(8*7*6!)`
Cancelling all 6! we get
`1/1 + 1/7 = x/(8 xx 7)`
`(7 + 1)/7 = x/(8 xx 7)`
`8/7 = x/(8 xx 7)`
x = `8/7 xx 7 xx 8` = 64
APPEARS IN
संबंधित प्रश्न
Find r if `""^5P_r = ""^6P_(r-1)`
How many numbers of six digits can be formed from the digits 0, 1, 3, 5, 7 and 9 when no digit is repeated? How many of them are divisible by 10 ?
In how many ways can 7 letters be posted in 4 letter boxes?
Write the number of words that can be formed out of the letters of the word 'COMMITTEE' ?
Number of all four digit numbers having different digits formed of the digits 1, 2, 3, 4 and 5 and divisible by 4 is
If (n+2)! = 60[(n–1)!], find n
Each of the digits 1, 1, 2, 3, 3 and 4 is written on a separate card. The six cards are then laid out in a row to form a 6-digit number. How many of these 6-digit numbers are divisible by 4?
Choose the correct alternative:
If Pr stands for rPr then the sum of the series 1 + P1 + 2P2 + 3P3 + · · · + nPn is
In how many ways 3 mathematics books, 4 history books, 3 chemistry books and 2 biology books can be arranged on a shelf so that all books of the same subjects are together.
8-digit numbers are formed using the digits 1, 1, 2, 2, 2, 3, 4, 4. The number of such numbers in which the odd digits do no occupy odd places is ______.
