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Aloiza [94]
3 years ago
5

PLEASE HELP ASAP! I AM TIMEDDDDDDDDDD

Mathematics
2 answers:
mestny [16]3 years ago
8 0

Answer:

They answerd it

Step-by-step explanation: :(

natima [27]3 years ago
3 0

Answer:

(E) 83

Step-by-step explanation:

So f(x) is the sum of all prime numbers less than x.

So f(86) is the sum of all prime numbers less than 86:

f(86) = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 + 73 + 79 + 83

=  874

Likewise, f(82) is the sum off all prime numbers less than it, which would be;

f(82) = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61 + 67 + 71 + 73 + 79

= 791

The problem asks us to do:

f(86) - f(82)

Substitute for numerical values:

874 - 791

solve

= 83

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