Question

Find the wrong term
7, 9, 17, 42, 91, 172, 293
(1)9
(2) 17
(3) 42
(4) 91​

Answer 1

Answer:

ANSWER

If the series would have 8 instead of 9 then the series becomes 7,9,17,41,91,172,293.

The difference we get between the two terms is 1,9,25,49,81,121 respectively which is nothing but the squares of odd numbers starting from 1.

i.e. 8−7=1=1

2

, 17−8=9=3

2

, and so on

hope it helps u

Answer 2

Answer:

The wrong term in the series 7,9,17,42,91,172,293 is 9 [option 1]

Step-by-step explanation:

Given

7,9,17,42,91,172,293

Here,

9-7= 2

17-9 = 8

42- 17 = 25 = $5^{2}$

91- 42 = 49=$7^{2}$

172-91 = 81=$9^{2}$

293-172 = 121 =$11^{2}$

So, here the difference between the numbers are the squares of consecutive odd numbers

So,

We have to get the difference of second term and first term as 1 and the difference of third and second term as 9 as the difference should follow the pattern :

$1^{2}, 3^{2} , 5^{2} ,7^{2} , 9^{2}$

Here, 9 is present in both the differences

So, 9 is the wrong term

Let us take x as the new term to replace 9

So,

x-7 = 1

x = 7+1 = 8

Also,

17-x = 9

x = 17-9 = 8

So, 9 is the wrong term and we should replace it by 8