Evaluate the expression.
-${ } _ { 7 } \mathrm { C } _ { 2 }$
A) 2520
B) 42
C) 21
D) $\frac { 7 } { 10 }$

Name: Evaluate the expression. -${ } _ { 7 } \mathrm { C } _ { 2 }$ A) 2520 B) 42 C) 21 D) $\frac { 7 } { 10 }$
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Question

Quizplus · Accepted Answer

${ } _ { 7 } \mathrm { C } _ { 2 } = \frac{7!}{2!(7-2)!} = \frac{7 \times 6}{2 \times 1} = 21$. This is the number of ways to choose 2 items out of 7 without regard to order.

Evaluate the Expression 7C2{ } _ { 7 } \mathrm { C } _ { 2 }7​C2​

Evaluate the Expression ${ } _ { 7 } \mathrm { C } _ { 2 }$