Question

An AP consisting of 49 terms has last term 28. If the common difference (2
of the term is 0.5. Find the first term and sum of terms.​

Answer 1

Answer:

49th term=a+(n-1)d

28=a+(49-1)0.5

28=a+24

a=28-24

a=4

Sum of 49 terms=n/2{2a+(n-1)d}

S49=49/2(8+24)

S49=49/2×32

S49=784