Answer:
Step-by-step explanation:
Multiply by 3 and add up by 2 215.3+2 =347 olur kolay gelsin
The next number is 647.
This is the sequence:
7 + 16 = 23
(16x3=48)
23+48=71
(48x3=144)
71+144=215
(144x3=432)
215+432=647
And so forth. Hope this helps.
