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प्रश्न
How many two letter words can be formed using letters from the word SPACE, when repetition of letters is not allowed?
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उत्तर
Two-letter word is to be formed out of the letters of the word SPACE.
When repetition of the letters is not allowed
1st letter can be selected in 5 ways
2nd letter can be selected in 4 ways
∴ By using fundamental principle of multiplication, total number of 2-letter words
= 5 × 4
= 20
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