Question

The sum of 40 terms of the series 1+ 2+ 3+ 4+ 5+ 8 + 7+ 16 + 9 + ... is-
(A) 398 + 2^20
(B) 398 +2^21
(C) 398 +2^19​

Answer 1

Step-by-step explanation:

1+2+3+4+5+8+7+16+9+...is 398+2^20

Answer 2

Answer:

s=?

n=40

a=1

d=1

s=n/2(2a+(n-1)d)

=40/2 *1+(40-1)1)

=20(2+(39)1)

=20(2+39)

=20(41)

=820