The sum of 15 terms of A. P. 3 , 6 , 9____
Answers
Answered by
1
Answer:
12
Step-by-step explanation:
It is the correct answer
Answered by
2
Answer: 360
Step-by-step explanation:
Common difference (d) = t 2 -t 1 = 6-3 = 3
First term (a ) = 3
No. of terms ( n) = 15
So,
Sum of terms = n/2[2a + (n – 1)d]
= 15 /2 [ 2*3 + 14 * 3 ]
=7.5 * ( 6+ 42)
=7.5 * 48
=360
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