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Explanation:

Out of 8 consonants, 4 consonants can be selected in 8C4   = 70 ways.

Out of 5 vowels, 3 vowels can be selected in 5C3

= 10 ways.

These 7 selected letters can be arranged among themselves in 7! ways.

Thus total number of ways = 70 ´ 10 ´ 7! = 3528000

Hence, option (c).

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