Question

Find the analogous pair of $(21,18,12,0)$ from the given alternatives.

• A. $(36,32,28,30)$
• B. $(24,22,19,9)$
• C. $(32,28,20,4)$
• D. $(40,38,36,28)$

Answer 1

Answer: (C)

$(32,28,20,4)$

All numbers in the given set have a common factor and on division give numbers that are reduced by powers of 2.

Eg.$(2^0,2^1,2^{2}etc)$
$21,18,12,0$ are all divisible by $3$ and on division give:
$7,(6=7-1),(4=6-2),(0=4-4)$

Similarly, when we divide each number of the set $32,28,20,4$ by $4$, we get
$8,(7=8-1),(5=7-2),(1=5-4)$
Hence, option C is correct.