Question

insert the missing number 7,26,63,124,215,342,__
a.)391
b.)421
c.)481
d.)511

Answer 1

Hey there

The answer is option (d) 511
(2*2*2) - = 7

(3*3*3) - 1 = 26

(4 *4 *4) - 1 = 63

(5 *5*5) - 1 = 124

(6 *6*6) - 1 = 215

(7 *7 *7) - 1 = 342

So,

(8 *8*8) - 1 = 511



HOPE YOU GOT IT
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Answer 2

Hi the answer is :-

the series follows the following pattern:-
$( {n}^{3} - 1)$
2^3 -1 =. 8-1 =7
3^3 - 1=. 27-1 =26
4^3 -1 =. 64-1 =63
5^3 -1. =. 125-1 = 124
6^3 -1 = 216-1 = 215
7^3 -1. =. 343-1 = 342
8^3 - 1 =. 512 -1 = 511. Ans