Given a positive integer n, how many strings of n letters from the English alphabet (26 letters) begin or end with a consonant? (assume exclusive or). n-1 ○ 2(21) (26)”—¹ — 2(21)² (26)”—² n-1 ○ 2(21) (26)¹-¹ — 2(21)(26)”—² (21)(26)”—² n-1 O 2(21) (26)-¹ 2(21) (26)¹-¹ – (21)² (26)”—² O None of these.

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A: To evaluate n+1!-n+2!, n∈N.

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