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What is Σ ( ) where is the number of ways of choosing k items from 28 items?

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a schoolyad contains only bicyles and 4 wheels wagons .on tuesday total no of wheels in the schoolyard was 90.what could be the possille no of bycyles? explanation.
option
a) 12
b) 14
c) 10
d) 11
In a 100m race, A beats B by 15m, B beats C by 10m. If A beats C by 5sec, find the speed of C.