Question

Find the missing term - 121, 211, 337, ?, 721, 991. Also explain.

Answer 1

Hey buddy,

If we observe the sequence carefully, we'll know that

It follows the formula
x^3-(x-1)

For example,

5^3 - 4 = 125-4 = 121
6^3 - 5 = 216-5 = 211
7^3 - 6 = 343-6 = 337
??????
9^3 - 8 = 729-8 = 721
10^3 - 9 = 1000-9 = 991
and so on

Now we have to find out number after 337 so
8^3 - 7 = 512-7 = 505

Missing number in sequence is 505.

Best luck buddy...

Answer 2

we have to find missing term in given series ; 121 , 211 , 337, ? , 721 , 991

here we observed that,
121 = 125 - 4 = 5³ - (5 - 1)
211 = 216 - 5 = 6³ - (6 - 1)
337 = 343 - 6 = 7³ - (7 - 1)
?
721 = 729 - 8 = 9³ - (9 - 1)
991 = 1000 - 9 = (10)³ - (10 - 1)

so, definitely we can say that missing term should be follow the rule like as 8³ - (8 - 1)

hence, missing term is 8³ - (8 - 1)
= 512 - 7 = 505

hence, answer is 505