In (12, 20, 28), every next number is obtained by adding 8 with the previous number and similarly, in (18, 30, 42).
every next number is obtained by adding 12 with the previous number.
Set of consecutive odd prime numbers.
In each set
2nd number = 1st number + 10-1
3rd number = 2nd number + 101
Let use see
As, 223 + 101 = 324
and 324 + 101 = 425
Similarly, 554 + 101 = 655
and 655 + 101 = 756
Each set is made of the digits 2, 4, 6, 8
All the numbers are perfect cubes.
Let us see
As, 8 = 23
1331 = 113
4913 = 173
Similarly, 64 = 43
All are prime numbers.
In each set
2nd number = 1st number x 7
and 3rd number = 1st number x 8
Let us see
As, 14 = 2 x 7
and 16 = 2 x 8
Similarly, 21 = 3 x 7
and 24 = 3 x 8
As, 841= (29) 2
Similarly, 289 = (17)2
As for finishing the 'Leather', 'Tanning' method is used, in the same way for 'Fireworks' pyrotechnics is used
As, F = 6 ? 63=216
Similarly, L = 12 &rArr: (12) 3=1728
Therefore = 1728
As, sum of digits of 584 = 5 + 8 + 4 = 17
and sum of digits of 488 = 4 + 8 + 8 = 20
Similarly, sum of digits of 294 = 2 + 9 + 4 =15
? Sum of digits of 378 = 3 + 7 + 8 = 18
Here, difference of both are (20 - 17 ) = ( 18 - 15 ) = 3
Therefore ? = 378 is an answer.
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