## Vineet Loomba is teaching live on Unacademy Plus

PERMUTATIONS AND COMBINATIONS JEE MAIN AND ADVANCED (IIT-JEE) IIT-IEE MATHS MADE EASY PREPARED BY: ER. VINEET LOOMBA IITiAN | IIT-JEE MENTOR FoR SURE SHoT SUcCESS IN JEE MAIN AND ADVANCED (IIT-JEE)

FOR 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) SPECIAL ANNOUNCEMENT Share useful links and advice with your learners... CRASH COURSE FOR JEE MAIN 2019 (JANUARY SESSION) Find courses & lessons 735 Courses IIT JEE 2,521 Courses Str Chemistry 797 Courses Details in Plus Tab w Eet My Feed HINDI Home My Library Plus Profile

REVISION COURSE FOR JEE MAIN AND ADVANCED (IIT-JEE) ABOUT ME B.Tech. From IIT Roorkee IIT-JEE Mentor Since 2010 Doubts/Feedback in Comment Section * Comment other topics you want to revise. Follow me @ https://unacademy.com/user/vineetloomba to get updates or search me on Google * Share among your peers as SHARING is CARING!!

FOR 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) DEARRANGEMENT THEOREM If n things are arranged in a row, the number of ways in which they can be dearranged so that no one of them occupies its original place is. 1! 2! 3! n. MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

FOR 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) If n things are arranged at n places then the number of ways to rearrange exactly r things at right places is 1 n-r r! 2! 3! 4! MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

FOR 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) Ex. There are 3 letters and 3 envelopes. Find the number of ways in which all letters are put in the wrong envelopes. (A) 6 The required number of ways (B) 4 (C) 2 (D) None of these Sol. =31L1-11 + 21-31 3! 2! Ans.[C] MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

FOR 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) There are 4 balls of different colour and 4 boxes of colours same as those of the balls. Then find the number of ways to place two balls in the boxes with respect to their colour. (A) 6 The required number of ways Ex. (B) 4 (C) 2 (D) None of these Sol. 4.3Ans.[A] MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)

FOR 100% SUCCESS IN JEE MAIN AND ADVANCED (IIT-JEE) ENROL for this Course (Free) Enroll 439 Recommend Lessons (Like) E . Rate and Review the Course .Comments . Sharing with friends 15 1. 68 26 ratings 7 reviews Share MATHEMATICS FOR IIT-JEE ER. VINEET LOOMBA (IIT RooRKEE)