What are

What are the four terms between 4 and 19?

Correct result:

a2 =  7
a3 =  10
a4 =  13
a5 =  16


a1=4 a6=19  an=a1+d (n1) a6=a1+5d d=a6a15=1945=3  a2=a1+d=4+3=7

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