A squad of 10 soldiers provides a guard of 3 men each night. Determine the number of nights each soldier will have to serve, if each triplet works only once.
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that's according to their situation they will serve
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So for this we will use the formula for combination
n!/r!(n-r)!
n is number of soldiers
r is number of soldiers taken at a time
10!/3!(7)!
120
n!/r!(n-r)!
n is number of soldiers
r is number of soldiers taken at a time
10!/3!(7)!
120
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