The way of selecting 4 letters from the word examination is
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examination
Total word = 11
If repetition is allowed then
No of ways = 11×11×11×11= 14641
If repetition is not allowed then
No of ways =11×10×9×8=7920
Total word = 11
If repetition is allowed then
No of ways = 11×11×11×11= 14641
If repetition is not allowed then
No of ways =11×10×9×8=7920
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