what letter should appear next?Y-W-T-P-?

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what letter should appear next?Y-W-T-P-?

what letter should appear next?Y-W-T-P-?
what letter should appear next?Y-W-T-P-?

what letter should appear next?Y-W-T-P-?
把二十六个字母用十进制数字表示出来,所以 Y-W-T-P 分别是 25,23,20,16...每两个数字中间分别相差 2,3,4,所以下一个数字就与16 相差4,也就是 11...答案是 K