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insert 3 arithmetic means between 52 and 40

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Zeninamicoperezviz
a1=52
a5=40

an=a1+(n-1)d
40=52(5-1)d
40-52=4d
-12/4=3
d= -3

a2=a1+d
52+(-3)
a2=29

a3=a1+2(d)
52+2(-3)
a3=46

a4=a1+3(d)
52+3(-3)
a4=43

a5=a1+4(d)
52+4(-3)
a5=40