Q

[RIJU]

After the first term, the sequence is such that an=2a(n-1). A16+a17+a18=?

[lego2401]

A18 = 2^17 *1

A16+a17+a18 =

2^15 + 2^16 + 2^17
= 2^15(1+2+4) = (2^15) * 7

[RIJU]

an=2a(n-1). How did you solve this....?

[lego2401]

Originally Posted by lego2401

A18 = 2^17 *1

A16+a17+a18 =

2^15 + 2^16 + 2^17
= 2^15(1+2+4) = (2^15) * 7

Ok here i assumed the first term was 1.

Regardless, The sum is (2^15)(7)(A1)

Now we need the value of A1