Find the 15th term of a sequence if the nth term = 3n + 4
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Answer:
Answer is 528
Step-by-step explanation:
nth
term = 3+4 n
1st
term = 3+4(1)=7
2nd
term = 3+4(2)=11
3rd
term 3+4(3)=15
It is an AP with a=7, d=4
S15 = 15/2 [2(7)+14(4)]
=15[7+28]
=525
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