Question

The sum of the first term and the fifth term of an ap is 26 and the product of the second term by the fourth term is 160. Find the sum of the first seven terms of this ap. (a) 110 (b) 114 (c) 112 (d) 116 13. The sum of the third and the ninth term of an ap is 10. Find a

Answer 1

answer is 110 thanks............