Question

the sum of first 20 terms of an A.P. is 400 and sum of first 40 terms is 1600 find the sum of first 10 terms​

Answer 1

Answer:

given that

the sum of first 20 terms of A.P is : 400

sum of first 40 terms is :1600

now we find the value of 10 terms

the answer is :the sum of first 10 terms is 200

because of the 20 term is 400

40 is 1600

now first we find the value of 30 then we get answer

off off the 1600 is 800

then of is 400

then of is 200

we get the answer now

10:200

20:400

30:800

40:1600

Answer 2

Answer:

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