Question

which term of the arthimetic progression 3,8,13,_ _ _ _ 78?

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Answer 1

Answer:

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Answer 2

Answer:

n=16

Step-by-step explanation:

Given : a=3  d=5   an(last term of Ap) =78

$a_{n} =a+(n-1)d\\78=3+(n-1)5\\78=3+5n-5\\78=-2+5n\\5n=78+2\\n=\frac{80}{5}\\n=16$

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