Select the option that is related to the fourth number in the same way as the first number is related to the second number and fifth number is related to sixth number.
15: 210 :: ? : 90 :: 20 : 380
Answer & explanation
Correct answer: option 1
15: 210 :: ? : 90 :: 20 : 380
The logic;
( First no. x first no. -1 = =Second number)
15 : 210
15 x 15-1
210
20 : 380
20 x20-1
380
Similarly,
? : 90
10 x10-1
90