Question: How many length 6 strings over the English alphabct (lowercase and uppercase) cxist? How many length-7 strings over = {a,b,c,...,4,2} contain the substring hello? How

How many length 6 strings over the English alphabct (lowercase and

How many length 6 strings over the English alphabct (lowercase and uppercase) cxist? How many length-7 strings over = {a,b,c,...,4,2} contain the substring "hello"? How many length-6 ternary strings are palindromes

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