Question

Find the sum of first 10 terms of an A.P. whose first term is 1 and common difference is 3.

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Here,

a=1

d=3

Using formula- an=a+(n-1)d

=1+(10-1)3

=1+9×3

=1+27

=28

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