How many positive integers 'n' can be form using the digits 3, 4, 4, 5, 6, 6, 7

Question

How many positive integers 'n' can be form using the digits 3, 4, 4, 5, 6, 6, 7 if we want 'n' to exceed 60,00,000?

Options:

A . 320

B . 360

C . 540

D . 720

Answer: Option C

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