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=a4a3=4730=17 d2=a3a2=3013=17  d1=d2  a1=a2d1=1317=4



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