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A letter lock consist of 3 rings each marked with 10 different letters .in how many ways its is possible to make an unsuccessful attempt to open the lock ?
Hii Manish We have 3 rings each marked with 10 different letters, So, possible no. of attempts to open the lock when letter can repeat will be = 10*10*10 =1000 attempts.among 1000 attempt 1 attempt will be successful . so total no of attempts required would be 999
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