if 1st and 2nd and last term of AP are a,b,2a resp. then its sum is
1. ab/2(b-a)
2. ab/b-a
3. ab/2(b-a)
4. none
Answers
Answered by
1
Answer:
4.none of these
because the formula is
Sn=n/2[2a+(n-1)d]
Answered by
6
Answer:
4th option is the correct answer
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