Find the sum of 12th term of the following AP series 7,11 and 15.
2 answers:
Answer:the sum of the 12th term of the AP is 348
Step-by-step explanation:
7,11,15
Common difference=d=11-7
d=4
First term=7
Using the formula
Sn=n/2 x (2a+d x (n-1))
S12=12/2 x (2x7+4x(12-1))
S12=6 x (14+4x11)
S12=6 x (14+44)
S12=6 x 58
S12=348
It is adding 4 each time.
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