How many terms of ap 24 21 18
Asked by admin @ in Math viewed by 303 People
How many terms of the AP : 24, 21, 18, . . . must be taken so that their sum is 78?
Answered by admin @
First term, a = 24
common difference, d = 21-24 = -3
let the number of terms to get sum 78 is n.
Solving the quadratic equation, we get n=4 and n=13.
So you can take either 4 terms or 13 terms to get the sum 78.
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