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The no. of 10 letter codes that can be formed using the characters x,y,z,r with the restriction that x appars exactly thrice and y appars exactly

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The no. of 10 letter codes that can be formed using the characters x,y,z,r with the restriction that x appars exactly thrice and y appars exactly twice in each such codes is

(a) 60840 

(b) 88400 

(c) 80640 

(d) 64080

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1 Answer

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Best answer

Correct option: (c) 80640

Explanation:

Total codes 80640

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