help@askiitians.com

+91-87964 74404

Grade 11Magical Mathematics[Interesting Approach]

in how many ways can letters of word ‘ARRANGEMENT’be arranged so that two ‘A’ and two ‘R’ does not comes together?

geetesh kumar

8 Years agoGrade 11

1 Answer

Arun

8 Years ago

Dear Geetesh

Total - {2Rs together + 2As together - RRAA all of them together}
.. beacuse both the cases where 2Rs/2As are together also include RRAA. We need to subtract those... Sort of Venn diagram problem
= 11!/(2!*2!*2!*2!) - {(2*10!/2!*2!2!) - 9!/2!*2! }

Regards

ARUN (askIITians forum expert)

Given that (1+5x)⁴ = 1 + Px + Qx² + Rx³ +..... Find the values of P - 2Q + 3R

magical mathematics[interesting approach]

1 Answer Available

Last Activity: 3 Years ago

9 men and 15 boys working 10 hours a day can make 12 pillars in 42 days, in how many days will 12 men and 22 boys working 8 hours a day can make pillars 4 times the previous number?

magical mathematics[interesting approach]

1 Answer Available

Last Activity: 4 Years ago

In the given figure, PQ is a tangent at a point C to a circle with centre O. If AB is a diameter, find angle PCA + angle BCQ?

magical mathematics[interesting approach]

1 Answer Available

Last Activity: 4 Years ago

for any two sets A and B (A-B)U(B-A)U (A intersection B)

magical mathematics[interesting approach]

0 Answer Available

Last Activity: 4 Years ago

If someone has got 150 out of 200 marks in term 1 exam and 160 out of 200 marks in term 2 exam then what is the percentage in 30:70

magical mathematics[interesting approach]

1 Answer Available

Last Activity: 4 Years ago

View all Questions