1.

Find tshe nth term of 25,22,19, 16 and find the sum of first 20 term

Answer»

Step-by-step EXPLANATION:

d=t2-t1

=22-25

=-3

d=t3-t2

=19-22

=-3

d=-3

a=25

S20=

sn=n/2(2A(n-1)d

s20=20/2(2×25(20-1)-3

=10(-7)

=-70



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