NCERT Solutions for Class 11 Maths Chapter 6 Permutations and Combinations Ex 6.1

# NCERT Solutions for Class 11 Maths Chapter 6 Permutations and Combinations Ex 6.1

NCERT Solutions for Class 11 Maths Chapter 6 Permutations and Combinations Ex 6.1 are the part of NCERT Solutions for Class 11 Maths. Here you can find the NCERT Solutions for Class 11 Maths chapter 6 Permutations and Combinations Ex 6.1.

## NCERT Solutions for Class 11 Maths Chapter 6 Permutations and Combinations Ex 6.1

### Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?Solution.There will be as many signals as there are ways of filling in 2 vacant places in succession by the 5 flags of different colours. The upper vacant place can be filled in 5 different ways by anyone of the 5 flags; following which the lower vacant place can be filled in 4 different ways by anyone of the remaining 4 different flags.Hence, by the multiplication principle, the required number of signals is 5 × 4, that is, 20.Related Links:NCERT Solutions for Maths Class 9NCERT Solutions for Maths Class 10NCERT Solutions for Maths Class 12

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