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What are the conditions for arithmetic progression a 1+A5 = a6 a2+A4 = a6 in senior high school mathematics?
a 1+a5=a6

a 1+(a 1+4d)= a 1+5d

a 1+4d=5d

a 1=d

a2+a4=a6

(a 1+d)+(a 1+3d)= a 1+5d

a 1+4d=5d

a 1=d

an = a 1+(n- 1)d = d+(n- 1)d = nd

When d=a 1, arithmetic progression satisfies:

am+an=a(m+n)