Question

5 : 21 :: 7 : ?
(a) 25
(b) 49
(c) 43
(d) 30 b 43​

Answer 1

Hello there !

5-1=4

5×4=20

20+1=21

similarly,

7-1=6

7×6=42

42+1=43

So the correct option will be (c) 43.

Hope it helps !