Find the sum all even numbers form 2 to 40. By using formula find S_n = a = 2, d = 2, a_n = 40
a_n = find after S_n = find

Open in App

Solution

$H i, 2 + 4 + 6 + . . . + 40; i t i s A P w i t h h e r e a = 2 a n d c o m m o n d i f f e r e n c e d = 2 a n d l a s t t e r m = a + (n - 1) d 40 = 2 + 2 (n - 1) 38 = 2 n - 2 n = 20 s o s u m = \frac{n}{2} (f i r s t + l a s t t e r m) = \frac{20}{2} (2 + 40) = 420$

Suggest Corrections

Similar questions

2

40

S_{n}

n

A P

d

a

S_{n} - 2 S_{n} + S_{n + 2}

a_{n} = 4, d = 2, S_{n} = - 14,

n

a

a = 2, d = 8

S_{n}

= 90

n

a_{n}

Find n and a_nwhere a=2, d=8 ,S_{n =90}

Join BYJU'S Learning Program