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Byju's Answer
Standard XII
Mathematics
Permutation: n Different Things Taken r at a Time
One fifth of ...
Question
One fifth of the number is
5
find the number.
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Solution
Consider the number
=
x
Based on the condition
1
5
×
x
=
5
By cross multiplication
x
=
5
×
5
=
25
Hence, the number is
25
.
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Permutation: n Different Things Taken r at a Time
Standard XII Mathematics
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