CBSE Class 10 Answered
If the pth term of an AP is 1/q and qth term 1/P. Prove that the sum of the first pqth term is 1/2 (pq + 1).
Asked by latayadav23 | 17 Oct, 2023, 08:39: PM
Expert Answer
Let a be the first term and d be the common difference of Arithmetic progression
pth term :- a + (p-1)d = (1/q) ........................ (1)
qth term :- a + ( q-1) d = ( 1/p ) .................... (2)
By subtracting eqn.(2) from eqn.(1) , we get
By substituting d in eqn.(1) , we get
from above expression , we get a = 1 / (pq)
Hence sum S of (pq) terms is
Answered by Thiyagarajan K | 17 Oct, 2023, 11:03: PM
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