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AP EAPCET 04-Jul-2022 Shift 1 Paper

Section: Mathematics

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Question : 18

Total: 160

A person writes letters to 6 friends and addresses the corresponding envelopes. In how many ways can the letters be placed in the envelopes so that at least two of them are in the wrong envelopes?
Notation Dn=n!(

)

‌6C4⋅D2
6
∑
r=3
‌6C6−r⋅Dr
6
∑
r=2
‌6C6−r⋅Dr
‌6C1D5+‌6C0⋅D6

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