Missing term

What is the missing term in the sequence? _____, 13, 30, and 47?

Correct result:

a1 =  -4

Solution:

a2=13 a3=30 a4=47  d1=a4−a3=47−30=17 d2=a3−a2=30−13=17  d1=d2  a1=a2−d1=13−17=−4

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