Question

The 21st term of the Ap whose first three terms are 10,6,2 ,........ is * 90 -70 70 -90

Answer 1

Step-by-step explanation:

a=t1=10. d=t2-t1=6-10=-4

tn=a+(n-1)d

t21=10+(21-1)*-4

=10+20*-4

=10-80

t21 = -70

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