Question

If tn is the nth term of an A.P. then the value of tn+1 - tn-1
1. 2a. 2. -2a. 3.2d. 4.-2d

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Answer 1

Answer:

2d

Step-by-step explanation:

tn+1 - tn-1 = { a+ (n+1- 1)d} - { a+ (n-1- 1)d}

= a + nd - a - nd + 2d

= 2d