25% because 21 is a quarter of 84. And 21 times 4= 84, so 21 is 25% of 84.
Answer:
2 6/25
Step-by-step explanation:
Becouse k and n are 'neighbours' so their sum are 180
so k=180-42=138
The formula of combination is
We have
and
Hence, there are 1001 ways of arranging 10 records from 14 records
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