Question

6, 15, 35, 77, 143, ?
(A) 171
(B) 221
(C) 181
(D) 191​

Answer 1

Step-by-step explanation:

6 is 2.3

15 is 3.5

35 is 5.7

77 is 7.11

143 is 11.13

now next term must be 13 × next prime no. ( 17 )

ans. is 221