Question

number the series 15, 29, 56, 109 ? ​

Answer 1

i think so 218 os the answer

Step-by-step explanation:

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Answer 2

Given,

The number series 15, 29, 56, 108, ? ​

To Find,

The fifth number of the given number series.

Solution,

To solve the given number series problem, we first need to find the relation between the numbers in the series.

If we look at the first number, we need to multiply with 2 and then we have to subtract the product of 2 and first real number to get the next number.

⇒ 15 × 2 - 2⁰= 29

The same pattern is followed in second number as it is multiplied by 2 and then the product of 2 and the second real number is subtracted.

⇒ 29 × 2 - 2¹ = 56

The same pattern is followed in third number as well,

⇒ 56 × 2 - 2² = 108

∴ The sequence will be followed in the fourth number as well to get the fifth number.

⇒ 108 × 2 - 2³ = 208

Hence, the fifth number in the given number series is 208.