Question

a
140) Which number replaces the question mark (?)
in the following number series?
1, 3, 26, 649, ?
A) 31790
B) 31800
C) 31801
D) 31812​

Answer 1

Answer:

Correct Answer - B (31800)

Step-by-step explanation:

We Start with: 1

Then: (2×2) ×1 -1 = 3

Then: (3×3) ×3 -1=26

Then: (5×5) × 26- 1= 649

Then: (7×7) × 649 - 1 = 30800

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Answer 2

Given : 1   3    26    649     ?

To find : Next number in Sequence

31790

31800

31801

31812

Solution:

1   3    26    649     ?

1

1  x 2² -  1 = 3

3 x  3² - 1  = 26

26 x 5² = 1  = 649

649 x 7² - 1 = 31800

Sequence here is previous number multiplied by square of prime number and 1 is subtracted  

Next number in series is 31800

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