1.

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

Answer»

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



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