Answer:
D or A
Step-by-step explanation:
Its adding the current number by the previous number so the next three would be 21,34,55
Answer:
42*3=126
28*5=140
the GCD of 126=2*3*3*7
the GCD of 140=2*2*5*7
2*7
GCD=14
Step-by-step explanation:
The answer is 2 radical 3
