Select the option that is related to the third number in the same way as the second number is related to the first number.
3 : 51 :: 7 : ?
Answer & explanation
Correct answer: option 4
The pattern followed is,
3 : 33 + 33 – 3
3 : 27 + 27 – 3
3 : 54 – 3
3 : 51
Similarly,
7 : 73 + 73 – 7
7 : 343 + 343 – 7
7 : 686 – 7
7 : 679