how many four digit numbers can be formed using the digits 2 3 5 6 7 and 9 which is divisible by 4 and no digits are repeated?
(a) 96
(b) 88
(c) 80
(d) 144
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Step-by-step explanation:
Total no. of digits =7
No. of ways 4 digit numbers can be formed with repetition =7×7×7×7=2401
No. of ways 4 can be formed with repetition =7×6×5×4=840
Therefore,
No. of ways 4 digit numbers can be formed if atleast one digit is repeated =2401−840=1561
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