Question

In an Ap 18,13,8,3,....S35=?​

Answer 1

Step-by-step explanation:

sn=n/2[2a+(n-1)d

where a=18, d= -5, n= 35

sn= 35/2[2×18+(34)-5]

= 2695

hope it's helpful

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Answer 2

Answer:

Step-by-step explanation:

a=18

d= -5

n= 35

Sn35= ?

Sn= n/2 ×[2×18(35-1)×(-5)]

=35/2×36-170

=630-170

=460