The number of n digit numbers formed by using digits {1, 2, 3} such that if 1 appears, it appears even number of times 2n+1 (3 + 1) 2 2(3-1) 2(2n-1) O E

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The number of n digit numbers formed by using digits {1, 2, 3} such that if 1 appears, it appears even number of times
2n+1
(3 + 1)
2
2(3-1)
2(2n-1)
O
E
Transcribed Image Text:The number of n digit numbers formed by using digits {1, 2, 3} such that if 1 appears, it appears even number of times 2n+1 (3 + 1) 2 2(3-1) 2(2n-1) O E
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