Find the tenth term of below series: 7, 16, 36, 78, 144, .....

M4maths Previous Puzzles

30 Mar 2017 Series

Find the tenth term of below series:
7, 16, 36, 78, 144, .....

OPtion

1) 212
2) 798
3) 668
4) 324
5) 900
6) 438
7) 546
8) 222
9) 216
10) 232

Solution

Answer: 900

Series is formed by = (nth Prime number* (n+1)th Prime number) +1
10th term = (10th Prime No. * 11th Prime No.) +1
= (29*31) +1 = 900

Option 5)

Correct Option: 5 Best Solution (2)