Question

find A and D for the following AP
20,17,14,11_ _ _ _ ?
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Answer 1

Answer:

a=20

Step-by-step explanation:

here,a=t1=20,t2=17,t3=14,t4=11

d=t2-t1=17-20=-3

=t3-t2=14-17=-3

t2-t1=t3-t2=....=-3=d=constant