What are

What are the four terms between 4 and 19?

Correct result:

a2 =  7
a3 =  10
a4 =  13
a5 =  16

Solution:

a1=4 a6=19  an=a1+d⋅ (n−1) a6=a1+5d d=a6−a15=19−45=3  a2=a1+d=4+3=7
a3=a2+d=7+3=10
a4=a3+d=10+3=13
a5=a4+d=13+3=16

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