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प्रश्न
How many two letter words can be formed using letters from the word SPACE, when repetition of letters is allowed?
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उत्तर
Number of letters in the word 'SPACE' = 5
In 2-lettered words, both the letters can be selected in 5 different ways, if repetitions of the letters are allowed.
∴ by fundamental principle of multiplication, the total number of 2-lettered words
= 5 × 5
= 25
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