Question

The 15tg term of an as is 40.find the sum of 14th and 16th terms.find the sum of first 29terms

Answer 1

Answer:

Solution: T15 = a+14d = 30, or

a = 30–14d

T14 = a+13d = 30–14d+13d = 30-d

T16 = a+15d = 30+d