find the sum of first 15 terms of the AP 12,19,26,... using formula
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Answer:
a15 = 110
Step-by-step explanation:
first term ( a ) = 12
common difference ( d ) = 7
7a15 = a + ( 15 - 1 ) d
= 12 + 14 × 7
= 12 + 98
= 110
hence, a15 = 110
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