Question

1) find the sum of ap series of 1+3+5+7____+199
2) if 9terms the nenth term of ap is equal to 12times the twelfth term show that the 21st term is zero.
3) find the sum of all 3 digit number which when divided by 16 leave remainder 1.

Answer 1

+9+11+13+15+17+29+21+23