Question

select the wrong term in the given number series

2,7,28,64,126,215

1.) 28.
2.) 64.
3.) 215
4.) 7
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Answer 1

Step-by-step explanation:

4) 7

is the answer

hope it works

Answer 2

The required "option 2) 64" is correct.

Step-by-step explanation:

The given series:

2, 7, 28, 64, 126, 215

To find, the wrong number = ?

The pattern follow:

$1^{3} +1,2^{3} -1,3^{3} +1,4^{3} -1,5^{3} +1,6^{3} -1,.......$

2 = $1^{3}$ + 1 = 1 + 1 = 2

7 = $2^{3}$ - 1 = 8 - 1 = 7

28 = $3^{3}$ + 1 = 27 + 1 = 28

64 = $4^{3}$ - 1 = 64 - 1 = 63 ≠ 64 (wrong number)

126 = $5^{3}$ + 1 = 125 + 1 = 126

215 = $6^{3}$ - 1 = 216 - 1 = 126

Thus, the required "option 2) 64" is correct.