sikchisurajp00iq5given:- sn=700000 n=7 d=-20000 a=? sn= n/2[2a+(n-1)d] 700000=7/2[2a+(7-1)-20000] 1400000=14a-840000 14a=2240000 a=160000 so the first prize will be of rs 160000 so second prize = a+d = 160000+(-20000) =rs140000 similarly third prize of rs 120000 fourth prize of rs 100000 fifth prize of rs 80000 sixth prize of rs 60000 and seventh prize of rs 40000
Answers & Comments
sn=700000 n=7 d=-20000 a=?
sn= n/2[2a+(n-1)d]
700000=7/2[2a+(7-1)-20000]
1400000=14a-840000
14a=2240000
a=160000
so the first prize will be of rs 160000
so second prize = a+d = 160000+(-20000) =rs140000
similarly
third prize of rs 120000
fourth prize of rs 100000
fifth prize of rs 80000
sixth prize of rs 60000
and seventh prize of rs 40000