How many strings of length 12 of uppercase letters contain exactly three vowels? Note: vowels and consonants may be repeated. Two examples are AACECCFGFJKF and QSUVBNCOXZTE 2612-219-53 12! (C(5, 3) x C(21, 9)) OC(12, 3) x 35 x 921 O12! (C(5, 3) × C(21, 9)) OC(12, 3) x 53 × 21⁹ OC(5, 3) x C(21, 9) × P(12, 12) - -

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