Question

15 12 21, 18 16 30, 7 ? 19 ans with detail​

Answer 1

Answer:

$15 - 18 = 3 \times 2 = 6 + 1 = 7 \\ 21 - 30 = 9 \times 2 = 18 + 1 = 19\\ \\ 12 - 16 = 4 \times 2 = 8 + 1 = 9$

option c)9 is your answer

good day

shri ram