how many 5 digit even number can be formrd using the digit 1,2,5,4,5
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digits = 1,2,5,4,5
total no of digits = 5
for even no. digit must be = 2 or 4
now,
case1: take its unit digit as 4
1000 th is filled in 4 ways
100 " """""""""""""""in 4 ways
10 th place is filled in 3 ways
we get , no = 4×3×4= 48
case2: take its unit digit as 2
1000 is filled in 8 ways
100 is filled in 4 ways
10 filled in 3 ways
no= 8×4×4= 64
no of times = 64+ 48= 112
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