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Question

Q. How many even numbers of 5 digits can be formed with the digits 1, 2, 3 and 4 (Repetition of digits are allowed)?

Q. 1, 2, 3 और 4 अंकों के प्रयोग से 5 अंकों की कितनी सम संख्या बन सकती है (अंकों की पुनरावृत्ति की अनुमति है)?

A

64
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B

256
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C

512
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D

1024
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Solution

The correct option is C
512
Out of the 5 positions, All 4 digits can occupy any of the 5 positions except the unit’s place. The unit’s place can only be taken by 2 or 4.
Thus, the total number of possibilities =4×4×4×4×2=512

5 पदों में से, सभी 4 अंक इकाई के स्थान के अलावा 5 पदों में से किसी को भर सकते हैं।
इकाई का स्थान केवल 2 या 4 के द्वारा भरा जा सकता है।
इस प्रकार, संभावनाओं की कुल संख्या =4×4×4×4×2=512

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