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Syllabus

(2n)!/n! = 2

^{n}(2n -1)(2n-3).....5.3.1find n

8pr=7p3+3*7p2?, find r?

[n-3][n-4][n-5]= 210

find the value of n

....pls explain each and every step

Ana: B.

Pls show!

"when a group photograph is taken, all 7 teachers should be in the first row and all the 18 students consisting of 12 boys and 6 girls should be in the second row such that no two girls are together and if the middle seat of the first row is reserved for the principal, how many arrangements are possible? "

Please help........

1*1! +2*2!+3*3!+....+n*n!

AnsB.

Show S:1 getting cases with reptitio

Please help in 16th question of p and c.......

Ans: BC

How?

Getting 278.

Ans: C. How if total words are 360

(i) COMMITTEE (ii) MISSISIPPI

Ans: B.

Why not A?

Ans;10 getting 5 used venn diagrsm

Please help in 15th question........

Ans: option c.

I think I m making a calci error.

Ans:B

How?

Ans:36

Help asp

Q.(1) How many numbers of 4 digits can be formed by using the digits 1, 2, 3, 4, 5, 6, 7 if no digit is repeated in any number? How many of these numbers are

(a) divisible by 2, (b) greater than 3400?

Please help......

Please help........