1.

If a1,a2,a3,....,an be an AP of non-zero terms. Prove that 1a1a2+1a2a3+....+1an−1an= n−1a1an

Answer»

If a1,a2,a3,....,an be an AP of non-zero terms. Prove that

1a1a2+1a2a3+....+1an1an=

n1a1an



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