Question

in an ap an=5n+2 find the 20th term and the sum of 20 terms​

Answer 1

20th term is 102

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Answer 2

Answer:

20th term is 102

and sum of 20 terms is 1090

Step-by-step explanation:

given, an = 5n+2

=> a1 = 5 x 1 +2 = 7

=> a20 = 5 x 20 +2 = 102

now, for sum

we know that,

s20 = 20/2(a1 + a20)

=

$\frac{20}{2} \times (7 + 102)$

$10 \times (109)$

$= 1090$

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