Question

Sum of first 24 terms in - 9-1 + 7 + ..... is
(i) 1992 (ii) 1662
(iii) 4620
(iv) None of the above​

Answer 1

Step-by-step explanation:

.......

4 is the write answer.......m.........

Answer 2

Step-by-step explanation:

here,

a=-9

d=8 and,

n=24

there for

sn 24= n/2 × (2a+( n-1) d)

= 24/2×{2×(-9)+(24-1)8}

= 12×{-18+(23×8)}

=12×{-18+184}

=12×{166}

=1992

ans is (i)