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# Solved Examples(Set 4) - Series - Odd Man Out

 16. Find the odd man out. $1,16,81,255,625,1296$ A. $1296$ B. $81$ C. $1$ D. $255$

Explanation:

The pattern is $1^4,2^4,3^4,4^4,5^4,6^4$

But $255$ is given in place of $4^4$

 17. Find the odd man out. $6,13,18,25,30,37,40$ A. $25$ B. $30$ C. $37$ D. $40$

Explanation:

The difference between two successive terms from beginning are $7,5,7,5,7,5$

Hence, in place of $40,$ right number is $37+5=42$

 18. Find the odd man out. $445,221,109,46,25,11,4$ A. $221$ B. $25$ C. $46$ D. $109$

Explanation:

$\dfrac{445-3}{2}=221\\\dfrac{221-3}{2}=109\\\dfrac{109-3}{2}=53\\\dfrac{53-3}{2}=25\\\dfrac{25-3}{2}=11\\\dfrac{11-3}{2}=4$

Therefore, $53$ should have come in place of $46$

 19. Find the odd man out. $1050,510,242,106,46,16,3$ A. $510$ B. $1050$ C. $106$ D. $46$

Explanation:

$\dfrac{1050-30}{2}=510\\\dfrac{510-26}{2}=242\\\dfrac{242-22}{2}=110\\\dfrac{110-18}{2}=46\\\dfrac{46-14}{2}=16\\\dfrac{16-10}{2}=3$

Therefore, $110$ should have come in place of $106$

 20. Find the odd man out. $2,3,5,9,12,17,23$ A. $12$ B. $2$ C. $23$ D. $9$

$2+1=3\\3+2=5\\5+3=8\\8+4=12\\12+5=17\\17+6=23$
Therefore, $8$ should have come in place of $9$