Question

15:215::16:342::26:511::65:?
options are
1)1330
2)1331
3)1332
4)1333​

Answer 1

Answer:

Step-by-step explanation:

given 15:215::16:342::26:511::65:

solution : 15/215 x 16/342 x 26/511 x 65

= 0.6 x 0.4 x 0.5 x 65

= 7.8

Answer 2

Answer:

Here 1330 is the correct answer.

Step-by-step explanation:

Given 15:215::16:342::26:511::65:?

This is a math of missing number.

If you notice carefully then you can see that this series maintains a sequence

I.e

In 15:215,

$5 + 1 = 6 \\ {6}^{3} = 216 \\ 216 - 1 = 215$

In 16:342,

$6 + 1 = 7 \\ {7}^{3} = 343 \\ 343 - 1 = 342$

In 26:511,

$2 + 6 = 8 \\ {8}^{3} = 512 \\ 512 - 1 = 511$

Now it is easy to find 65:?

$6 + 5 = 11 \\ {11}^{3} = 1331 \\ 1331 - 1 = 1330$

So, Required number is 1330.