In an AP, the sum of first n term is 3n²/2+5n/2. Find its first term and the sum of first two terms. Also, find the 25th term of this AP.
In an AP, the sum of first n term is 3n²/2+5n/2. Find its first term and the sum of first two terms. Also, find the 25th term of this AP.
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Answer:
Step-by-step explanation:
sum of n terms given from here 1st term can be found by substituting n=1 A
sum of first two terms can be found by substituting n=2 B
2nd term can be found by subtracting A and B