Question

Insert the two missing numbers:
6 9 18 21 42 45 ?
(1) 90, 93
(3) 80, 85
(2) 42, 45
(4) 90, 84​

Answer 1

90

and

93

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Answer 2

(1) is the correct answer.
first of all the correct series are -
3 6 9 18 21 42 45.
step by step explanation :
3×2=6+3=9.
in this way so on.
multiply the first number to 2 and then add 3 to it. Hence 90, 93 are correct pairs.