Question

Series: 56, 63, 77, 98, 121, 161.

Find the options which are true about wrong term of series.

a: square of a prime number.

b: it is an odd number

c: The sum of digits is 5.

1. Only c
2. Only b
3. Both a and b
4. Both b and c
5. Only a

Answer 1

Correct Answer - Option 3 : Both a and b

Given:

Series: 56, 63, 77, 98, 121, 161.

Calculation:

⇒ 56 + 7 = 63

⇒ 63 + 14 = 77

⇒ 77 + 21 = 98

⇒ 98 + 28 = 126 ≠ 121

⇒ 126 + 35 = 161

In above series, 121 is the wrong term of series.

Option a states that -

⇒ √121 = 11, 11 is a prime number so it is true.

Option b states that -

⇒ 121 is a odd number.

Option c states that -

⇒ 1 + 2 + 1 = 5 ≠ 4, it is false statement.

∴ From above, option a and b are true.