A shoping mall is running a scheme: Each packet of detergent SURF | Filo
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Class 12

Math

Algebra

Probability I

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A shoping mall is running a scheme: Each packet of detergent SURF contains a coupon which bears letter of the word SURF, if a person buys at least four packets of detergent SURF, and produce all the letters of the word SURF, then he gets one free packet of detergent.
If a person buys 8 such packets at a time, then the number of different combinations of coupon he has is

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