Question

find the sum of first 25 terms of an AP whose n th term is given by an = 2-3n​

Answer 1

Answer:

Step-by-step explanation:

aₙ = 2-3n

a1 = -1

a2 = -4

a3 = -7

So we come to know that a=(-1) and d=-3

s25= n/2(2a+(n-1)d)

=25/2 (-2-3n+3)

=25/2 (1-75)

=25/2 x -74

=25 x -37

=-925

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