Question

find the sums given 34+32+30+........10

Answer 1

28+26+24+22+20+18+16+14+12

Answer 2

(ii)34 + 32 + 30 + ……….. + 10

For this A.P.,

a = 34

d = a2 − a1 = 32 − 34 = −2

l = 10

Let 10 be the nth term of this A.P.

l = a + (n − 1) d

10 = 34 + (n − 1) (−2)

−24 = (n − 1) (−2)

12 = n − 1

n = 13