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I assume that a letter may occur more than once. There are 6 letters in the word 'Marble.' The first letter 'must' be M. The second letter may be chosen in 6 ways. The third, fourth, fifth and the sixth may be chosen in 6 ways. There are 6 to the power 5 = 7,776 words. If the letters cannot repeat: The first letter is always 'M.' The second letter may be chosen in 5 ways. The third in four ways, the fourth in 3 ways, the fifth is 2 ways and the sixth in 1 way. 5x4x3x2x1 = 120 words with first letter M.
No. Proof: A number ending in 6 is divisible by 2, The only prime number divisible by 2 is 2 itself. A number ending in 6 is larger than 2.