Question

IF THE SECOND AND FORTY FIFTH TERM OF AN AP IS 10 AND 96 RESPECTIVELY. FIND THE FIRST TERM AND COMMON DIFFERENCE.ALSO FIND THE SUM OF FIRST FIFTEEN TERMS

Answer 1

T45-T2 = 43d = 86
d=2

I expect now you can find a, and of course,

S45 = a + 44/2 (2*10 + 43d)
or
S45 = 45/2 (2a+44d)