Question

what is the answer of the question number 24
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Answer 1

HEY MATE

HERE IS YOUR ANSWER

Given: 2+6+10+......... +x = 1800

Here as considering it AP

a = 2

d = 10 - 6 = 6 - 2 = 4

an = x

Sn = n/2 [ 2a + (n - 1)d]

Sx = x/2 [ 2 * 2 + (x - 1) 4]

1800= x/2 [4 + 4x - 4]

1800 = x/2 * 4x

1800 = 2x^2

900 = x^2

taking square root

x = 30

HOPE IT HELPS

PLZ MARK IT AS BRAINLIEST

Answer 2

The answer to this question was 118..

the girl who answered above gave the number of terms in the ap.

use the number of terms to find the last digit.

last term = a + (n-1) d

x = 2 + (30-1) 4

x = 2 + 116

x = 118

if you wanna verify then,

sum of ap = n /2 × (first + last term)

1800 = 30/2 × (2+118)

1800 = 15 × 120

1800 = 1800

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