Question

Cara, a blue whale participated in a weight loss program at the biggest office. At the end of every month, the decrease in weight from original weight was measured and noted as 1, 2, 6, 21, 86, 445, 2676. While cara made a steadfast effort, the weighing machine showed an erroneous weight once. What was that.

Answer 1

Answer:

The answer is 86 i.e the erroneous weight is this

Explanation:

According to the problem the rate of weight loss of three people in every month is a series.

Now just look at the pattern:

1x 1+1=2

2 x 2+2=6

6 x 3+3=21

like this,

21 x 4+4=88

88 x 5+5 = 445

445*6+6 = 2676

but here the series contains 86 which is wrong.

therefore this sis the error.