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থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

All combination locks manufactured by the Gulzar Combination Lock Company have a combination that consists of four elements a one-digit number, a two-digit number, and two letters of the alphabet. Each combination conforms to the following rules. i. The one-digit number is the first element in the combination. ii. The two letters of the alphabet are not adjacent elements in the combination. iii. The two-digit number consists of two different numerals. iv. The two-digit number has no numerals in common with the one-digit number. Which of the following CANNOT be the first element of a combination that has K-53-J as its second, third, and fourth elements?

A. 5
B. 6
C. 7
D. 8
E. 9
Explanation: Because it is common with the 2-digit number.