Question

For the given series 2, 4, 6, 8..... 80. Find out sum​

Answer 1

Step-by-step explanation:

ANSWER

Given sequence is: 2+4+6+.......+80

Here, a=2,d=4−2=2,a

n

=80

a

n

=a+(n−1)d

⇒80=2+(n−1)2

⇒80=2n⇒n=40

⇒S

40

=

2

40

{2a+(n−1)d}

=20{4+78}

=20×82

=1640

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