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The first term a of an A.P is equal to twice the common difference d....

Mathematics
WAEC 1991
The first term a of an A.P is equal to twice the
common difference d. Find, in terms of d, the 5th
term of the A.P.
  • A. 4d
  • B. 5d
  • C. 6d
  • D. a + 5d
  • E. 2a + 4d
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Correct Answer: Option C
Explanation
Tn = a + (n - 1)d; AP; a = 2d; Tn = 2d + (n - 1)d

T5 = 2d + (5 - 1)d = 2d + 4d = 6d
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