Question

(viii) 4pq - 6p2 - 207, 9p2​

Answer 1

Answer:

9p2 is the number of permutations of the selections of 2 items from 9 distinct items. That is, the number of ordered selections of 2 items pulled from 9.

This is related to the count of the combinations of 2 items selected from 9, by multiplying that by the count of the permutations of 2 items.

9P2=9C2×2!=9!2!(9−2)!×2!=9!7!=9×8=72

Answer 2

Answer:

here

Step-by-step explanation:

4pq+9p2-6p2-207

=4pq+3p2-207

hope this helped you well

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