If nth term of an A.P. is (2n + 1), what is the sum of its first three terms ?
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If nth term of an A.P. is (2n + 1), what is the sum of its first three terms ?
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꧁Explaination ꧂
We need to find sum of first three terms
Finding first three terms
= 2(1) + 1
= 2 + 1
= 3
= 2(2) + 1
= 4 + 17
= 5
= 2(3)+1
= 6 +1
= 7
So,
Sum of first three terms = ++
= 3 + 5 + 7
= 15
hope it will help you