Question
Download Solution PDFHow many terms are there in the series 9, 12, 15, 18, ......., 87 ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
9, 12, 15, 18, ......., 87
Concept used:
an = a + (n - 1)d
a = first term = 9
d = difference = 12 - 9 = 3
Calculation:
an = 87
⇒ 87 = 9 + (n - 1)3
⇒ 78 = 3n - 3
⇒ 3n = 81
⇒ n = 27
∴ There are a total of 27 terms.
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