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Syllabus

(2n)!/n! = 2

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

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

"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? "

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

find the value of n

....pls explain each and every step

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

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

(i) COMMITTEE (ii) MISSISIPPI

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

Ans: option c.

I think I m making a calci error.

AnsB.

Show S:1 getting cases with reptitio

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......

Ans:B

How?

Please help........