23rd q "the sum Mm temu«.n is 'h
(m • n)th tenn is the negative ofthe ten,
e Same as the sum n terms. then snow mat the
) An AP.. has h • 1
sum of as even terms prove 'ha' S, - S. A r,d, where A is the
cornrnon difference.
the ratio Ot the Sun m terms and n terms an A,p, be Prove that the
Fin"' and ten•ns ) (2n
S - Sym S4, sw. ale in rnd out the cornmon diffelence