Let be an AP,
and
.
If and
then is equal to:
52
57
47
42
Sum of n terms of an AP -
and
Sum of n terms of an AP
- wherein
first term
common difference
number of terms
Last term of an A.P.(l) -
- wherein
If a series has n terms last term is
Summation of terms of an AP
or,
Now,
Now use,
Give
Now,
52
Option 2)57
Option 3)47
Option 4)42
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