Question

What is the missing no.
1,5,21,85,???

Answer 1

Answer:

341

Step-by-step explanation:

Solution1 = 1

1+4 = 5

1+4+4^2 = 5+16 = 21

1+4+4^2+4^3 = 5+16+64 = 85

Similarly

1+4+4^2+4^3+4^4 = 5+16+64+256 = 341

Answer 2

The difference between 1. and 5. is 4

The difference between 5. and 21 is 16

The difference between 21 and 85 is 64

( note: the number are multipled by 4 )

( like 4,16 *4,64*4,)

so the answer will be 256+85

which is 341

hope this answer helps you ⭐⭐