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Shreyans Singh
Subject: Maths
, asked on 13/5/18
Solve this:
Answer
1
Shreyans Singh
Subject: Maths
, asked on 13/5/18
Q. From a group of 7 men and 6 women , 5 persons are to be selected to form a committee so that atleast 3 men are there on the committee . In how many can it be done ?
Answer
1
Shashwat Pathak
Subject: Maths
, asked on 8/5/18
Q. Let t
_{m}
denote the sum of m
^{th}
power of the reciprocals of the roots of the equation 1 + x / 1 ! + x
^{2}
/2! + ..................x
^{n}
/n! show that t
_{2}
= t
_{3}
= .....t
_{n}
= 0 and t
_{n+1}
=
$\frac{1}{n!}$
Answer
1
Rajarshi Das
Subject: Maths
, asked on 27/4/18
^{n}
c
_{x=}
^{n}
c
_{y}
and , x not equal to y, Then x+y=?
Answer
1
Ayan
Subject: Maths
, asked on 18/4/18
plzz provide answer for 1,2,3
$\mathrm{Q}1.3{\mathrm{log}}_{\mathrm{x}}^{4}+2{\mathrm{log}}_{4\mathrm{x}}^{4}+3{\mathrm{long}}_{16\mathrm{x}}^{4}=0\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{Q}2.{\mathrm{log}}_{10}\sqrt{\mathrm{log}{\mathrm{x}}_{10}}={\mathrm{log}}_{{\mathrm{x}}^{2}}^{\mathrm{x}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{Q}3.7{\mathrm{log}}_{10}^{\mathrm{x}}=98-\mathrm{x}{\mathrm{log}}_{10}^{7}$
Answer
1
Dharmveer Gautam
Subject: Maths
, asked on 31/3/18
Please explain the marked step .
Answer
1
Dharmveer Gautam
Subject: Maths
, asked on 31/3/18
Please explain the marked step for this question:
$Findr,if5{}^{4}P_{r}=6{}^{5}P_{r-1}$
Marked step:
$\frac{5!}{(4-r)!}=\frac{6\times 5!}{(5-r+1)(5-r)(5-r-1)!}$
Answer
1
Dhriti Gupta
Subject: Maths
, asked on 30/3/18
An 8 oared boat is to be manned by 8 men of whom 2 can row on bow side and one can row on stroke side. The number of ways in which the crew can be arranged
Answer
2
Aditya Singh
Subject: Maths
, asked on 30/3/18
Q.17 Out of 5 apples , 10 mangoes and 15 oranges , the number of ways distributing 15 fruits each to two persons is (a) 56 (b) 64 (c) 66 (d)72 Q.18 The number of divisors of the form 4n+ 1 , n
$\ge $
0 of the number 10
^{10}
11
^{11}
13
^{13 }
is (a) 750 (b) 840 (c) 924 (d) 1024
Answer
1
Mauhid Usmani
Subject: Maths
, asked on 29/3/18
Questions no 67. A bag contains 3 black, 4 white and 2 red balls, all the balls being different. The number of selections of at most 6 balls containing balls of all the colours is
Answer
1
Mauhid Usmani
Subject: Maths
, asked on 26/3/18
Number of rectangles in figure shown, which are not squares is
(a) 159 (b) 160 (c) 161 (d) None
Answer
1
Chharishma.r.nayaka
Subject: Maths
, asked on 23/3/18
Plz ans soon..
30. In how many ways can 5 girls and 3 boys be seated in a row so that no two boys are together.
Answer
1
Ekta Ray
Subject: Maths
, asked on 23/3/18
Pls solve this
Illustration 6.93 Find the number of ways in which six persons can be seated at a round table, so that all shall not have the same neighbors in any two arrangements.
Answer
1
Ekta Ray
Subject: Maths
, asked on 22/3/18
Pls solve this
Illustration 6.86 Find the number of ways in which A A A B B B can be placed in the squares of Fig. 6.14 as shown, so that no row remains empty. Fig. 6.14
Answer
1
Ekta Ray
Subject: Maths
, asked on 12/3/18
Pls solve this qs
There are 10 lamps in a hall. Each one of them can be switched
on independently. What is the probability that the hall will be
illuminated for random selection of any one position of all the
switches?
Answer
1
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2
3
4
5
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What are you looking for?

_{m}denote the sum of m^{th}power of the reciprocals of the roots of the equation 1 + x / 1 ! + x^{2}/2! + ..................x^{n}/n! show that t_{2}= t_{3}= .....t_{n}= 0 and t_{n+1}= $\frac{1}{n!}$^{n}c_{x=}^{n}c_{y}and , x not equal to y, Then x+y=?$\mathrm{Q}1.3{\mathrm{log}}_{\mathrm{x}}^{4}+2{\mathrm{log}}_{4\mathrm{x}}^{4}+3{\mathrm{long}}_{16\mathrm{x}}^{4}=0\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{Q}2.{\mathrm{log}}_{10}\sqrt{\mathrm{log}{\mathrm{x}}_{10}}={\mathrm{log}}_{{\mathrm{x}}^{2}}^{\mathrm{x}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\mathrm{Q}3.7{\mathrm{log}}_{10}^{\mathrm{x}}=98-\mathrm{x}{\mathrm{log}}_{10}^{7}$

Marked step: $\frac{5!}{(4-r)!}=\frac{6\times 5!}{(5-r+1)(5-r)(5-r-1)!}$

^{10}11^{11}13^{13 }is (a) 750 (b) 840 (c) 924 (d) 1024(a) 159 (b) 160 (c) 161 (d) None

30. In how many ways can 5 girls and 3 boys be seated in a row so that no two boys are together.

Illustration 6.93 Find the number of ways in which six persons can be seated at a round table, so that all shall not have the same neighbors in any two arrangements.

Illustration 6.86 Find the number of ways in which A A A B B B can be placed in the squares of Fig. 6.14 as shown, so that no row remains empty. Fig. 6.14

There are 10 lamps in a hall. Each one of them can be switched

on independently. What is the probability that the hall will be

illuminated for random selection of any one position of all the

switches?