Question

in the series (n-1)(n-2),(n-3...find an​

Answer 1

Answer:

we have formula for an=a(n-1)d

a is first digit

d is distance

d= a2-a1

=n-2 -(n-1)

= -1

now put in formula

an =( n-1)(n-1)(-1)

=(n-1)²(-1)