Math, asked by siddharthdullu3532, 4 hours ago

13 term of Arithmetical sequence 57 find sum of first25 term of this sequence

Answers

Answered by hypoN

1

Answer:

1425

Step-by-step explanation:

a(13) = 57

So, 57 = a + 12d (Consider this eq 1)

Now,

S(25) = (25/2)(2a + 24d)

= (25/2)*2(a+12d)

According to eq. 1

= 25*57

= 1425

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