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3 years ago

11

Plz, help me with this question!

1 answer:

Leto [7]3 years ago

3 0

Answer:

870

Step-by-step explanation:

Assuming you mean

30 $P_{2}$

Using the definition

n $P_{r}$ = $\frac{n!}{(n-r)!}$

where n! = n(n - 1)(n - 2) ..... 3 × 2 × 1

Then

30 $P_{2}$ = $\frac{30!}{28!}$ = $\frac{30(29)(28)(27)...}{28(27)(26).....}$

Cancel the terms 28(27)... on numerator/ denominator, leaving

30 $P_{2}$ = 30 × 29 = 870

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