self Maths Puzzle


66, 36, 18, ?

A. 3 B. 6
C. 8 D. 9

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self Other Question

240, ?, 120, 40, 10, 2

A. 180 B. 240
C. 420 D. 480

In the series 3, 9, 15, ...... what will be the 21st term?

A. 117 B. 121
C. 123 D. 129