Question

if sn equals to 5 n square then find the value of 12 term​

Answer 1

Answer:

-6

Step-by-step explanation:

sn=5n^2

then s1=5*1^2=5

and s2=5×2^2=9

now a1=s1=5 ,a2=s2-s1=9-5=4

so, d=a2-a1=4-5=-1

hence, a12=a+(12-1)d

=5+11*(-1)

=5-11

=-6